diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index fc010b55..13ce6f9e 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -20,16 +20,6 @@ parameters:
 			count: 6
 			path: src/PhpSpreadsheet/Calculation/Calculation.php
 
-		-
-			message: "#^Cannot call method getColumn\\(\\) on PhpOffice\\\\PhpSpreadsheet\\\\Cell\\\\Cell\\|null\\.$#"
-			count: 2
-			path: src/PhpSpreadsheet/Calculation/Calculation.php
-
-		-
-			message: "#^Cannot call method getCoordinate\\(\\) on PhpOffice\\\\PhpSpreadsheet\\\\Cell\\\\Cell\\|null\\.$#"
-			count: 2
-			path: src/PhpSpreadsheet/Calculation/Calculation.php
-
 		-
 			message: "#^Cannot call method getHighestColumn\\(\\) on PhpOffice\\\\PhpSpreadsheet\\\\Worksheet\\\\Worksheet\\|null\\.$#"
 			count: 1
@@ -40,21 +30,6 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Calculation/Calculation.php
 
-		-
-			message: "#^Cannot call method getRow\\(\\) on PhpOffice\\\\PhpSpreadsheet\\\\Cell\\\\Cell\\|null\\.$#"
-			count: 2
-			path: src/PhpSpreadsheet/Calculation/Calculation.php
-
-		-
-			message: "#^Cannot call method getTitle\\(\\) on PhpOffice\\\\PhpSpreadsheet\\\\Worksheet\\\\Worksheet\\|null\\.$#"
-			count: 1
-			path: src/PhpSpreadsheet/Calculation/Calculation.php
-
-		-
-			message: "#^Cannot call method has\\(\\) on PhpOffice\\\\PhpSpreadsheet\\\\Collection\\\\Cells\\|null\\.$#"
-			count: 1
-			path: src/PhpSpreadsheet/Calculation/Calculation.php
-
 		-
 			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Calculation\\\\Calculation\\:\\:_translateFormulaToEnglish\\(\\) has no return type specified\\.$#"
 			count: 1
@@ -140,11 +115,6 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Calculation/Calculation.php
 
-		-
-			message: "#^Parameter \\#1 \\$parent of method PhpOffice\\\\PhpSpreadsheet\\\\Cell\\\\Cell\\:\\:attach\\(\\) expects PhpOffice\\\\PhpSpreadsheet\\\\Collection\\\\Cells, PhpOffice\\\\PhpSpreadsheet\\\\Collection\\\\Cells\\|null given\\.$#"
-			count: 1
-			path: src/PhpSpreadsheet/Calculation/Calculation.php
-
 		-
 			message: "#^Parameter \\#1 \\$str of function preg_quote expects string, int\\|string given\\.$#"
 			count: 1
diff --git a/src/PhpSpreadsheet/Calculation/Calculation.php b/src/PhpSpreadsheet/Calculation/Calculation.php
index 5f2af864..7a48a7cb 100644
--- a/src/PhpSpreadsheet/Calculation/Calculation.php
+++ b/src/PhpSpreadsheet/Calculation/Calculation.php
@@ -3223,10 +3223,11 @@ class Calculation
                 //    So instead we skip replacing in any quoted strings by only replacing in every other array element
                 //       after we've exploded the formula
                 $temp = explode(self::FORMULA_STRING_QUOTE, $formula);
-                $i = false;
+                $notWithinQuotes = false;
                 foreach ($temp as &$value) {
                     //    Only adjust in alternating array entries
-                    if ($i = !$i) {
+                    $notWithinQuotes = !$notWithinQuotes;
+                    if ($notWithinQuotes === true) {
                         $value = self::translateFormulaBlock($from, $to, $value, $inFunctionBracesLevel, $inMatrixBracesLevel, $fromSeparator, $toSeparator);
                     }
                 }
@@ -3898,10 +3899,11 @@ class Calculation
                 $temp = explode(self::FORMULA_STRING_QUOTE, $formula);
                 //    Open and Closed counts used for trapping mismatched braces in the formula
                 $openCount = $closeCount = 0;
-                $i = false;
+                $notWithinQuotes = false;
                 foreach ($temp as &$value) {
                     //    Only count/replace in alternating array entries
-                    if ($i = !$i) {
+                    $notWithinQuotes = !$notWithinQuotes;
+                    if ($notWithinQuotes === true) {
                         $openCount += substr_count($value, self::FORMULA_OPEN_MATRIX_BRACE);
                         $closeCount += substr_count($value, self::FORMULA_CLOSE_MATRIX_BRACE);
                         $value = str_replace($matrixReplaceFrom, $matrixReplaceTo, $value);
@@ -4593,7 +4595,7 @@ class Calculation
                         if (strpos($operand1Data['reference'], '!') !== false) {
                             [$sheet1, $operand1Data['reference']] = Worksheet::extractSheetTitle($operand1Data['reference'], true);
                         } else {
-                            $sheet1 = ($pCellParent !== null) ? $pCellWorksheet->getTitle() : '';
+                            $sheet1 = ($pCellWorksheet !== null) ? $pCellWorksheet->getTitle() : '';
                         }
 
                         [$sheet2, $operand2Data['reference']] = Worksheet::extractSheetTitle($operand2Data['reference'], true);
@@ -4602,21 +4604,23 @@ class Calculation
                         }
 
                         if (trim($sheet1, "'") === trim($sheet2, "'")) {
-                            if ($operand1Data['reference'] === null) {
-                                if ((trim($operand1Data['value']) != '') && (is_numeric($operand1Data['value']))) {
+                            if ($operand1Data['reference'] === null && $cell !== null) {
+                                if (is_array($operand1Data['value'])) {
+                                    $operand1Data['reference'] = $cell->getCoordinate();
+                                } elseif ((trim($operand1Data['value']) != '') && (is_numeric($operand1Data['value']))) {
                                     $operand1Data['reference'] = $cell->getColumn() . $operand1Data['value'];
-                                // @phpstan-ignore-next-line
-                                } elseif (trim($operand1Data['reference']) == '') {
+                                } elseif (trim($operand1Data['value']) == '') {
                                     $operand1Data['reference'] = $cell->getCoordinate();
                                 } else {
                                     $operand1Data['reference'] = $operand1Data['value'] . $cell->getRow();
                                 }
                             }
-                            if ($operand2Data['reference'] === null) {
-                                if ((trim($operand2Data['value']) != '') && (is_numeric($operand2Data['value']))) {
+                            if ($operand2Data['reference'] === null && $cell !== null) {
+                                if (is_array($operand2Data['value'])) {
+                                    $operand2Data['reference'] = $cell->getCoordinate();
+                                } elseif ((trim($operand2Data['value']) != '') && (is_numeric($operand2Data['value']))) {
                                     $operand2Data['reference'] = $cell->getColumn() . $operand2Data['value'];
-                                // @phpstan-ignore-next-line
-                                } elseif (trim($operand2Data['reference']) == '') {
+                                } elseif (trim($operand2Data['value']) == '') {
                                     $operand2Data['reference'] = $cell->getCoordinate();
                                 } else {
                                     $operand2Data['reference'] = $operand2Data['value'] . $cell->getRow();
@@ -4829,7 +4833,7 @@ class Calculation
                             $this->debugLog->writeDebugLog('Evaluation Result for cell %s in worksheet %s is %s', $cellRef, $matches[2], $this->showTypeDetails($cellValue));
                         } else {
                             $this->debugLog->writeDebugLog('Evaluating Cell %s in current worksheet', $cellRef);
-                            if ($pCellParent->has($cellRef)) {
+                            if ($pCellParent !== null && $pCellParent->has($cellRef)) {
                                 $cellValue = $this->extractCellRange($cellRef, $pCellWorksheet, false);
                                 $cell->attach($pCellParent);
                             } else {
@@ -5281,7 +5285,7 @@ class Calculation
             }
 
             // Named range?
-            $namedRange = DefinedName::resolveName($range, $worksheet);
+            $namedRange = DefinedName::resolveName($range, /** @scrutinizer ignore-type */ $worksheet);
             if ($namedRange === null) {
                 return Information\ExcelError::REF();
             }
diff --git a/tests/PhpSpreadsheetTests/Reader/Xlsx/Issue2778Test.php b/tests/PhpSpreadsheetTests/Reader/Xlsx/Issue2778Test.php
new file mode 100644
index 00000000..925b6fa4
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Reader/Xlsx/Issue2778Test.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Reader\Xlsx;
+use PHPUnit\Framework\TestCase;
+
+class Issue2778Test extends TestCase
+{
+    /**
+     * @var string
+     */
+    private static $testbook = 'tests/data/Reader/XLSX/issue.2778.xlsx';
+
+    public function testIssue2778(): void
+    {
+        $filename = self::$testbook;
+        $reader = new Xlsx();
+        $spreadsheet = $reader->load($filename);
+        $sheet = $spreadsheet->getActiveSheet();
+        self::assertSame(6, $sheet->getCell('D1')->getCalculatedValue());
+        self::assertSame(63, $sheet->getCell('F1')->getCalculatedValue());
+        self::assertSame(10, $sheet->getCell('C10')->getCalculatedValue());
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/data/Reader/XLSX/issue.2778.xlsx b/tests/data/Reader/XLSX/issue.2778.xlsx
new file mode 100644
index 00000000..68cbe288
Binary files /dev/null and b/tests/data/Reader/XLSX/issue.2778.xlsx differ