Fix for null value passed to extractSheetTitle()

phpstan-baseline.neon

@@ -95,6 +95,11 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Calculation/Calculation.php
 
+		-
+			message: "#^Negated boolean expression is always true\\.$#"
+			count: 1
+			path: src/PhpSpreadsheet/Calculation/Calculation.php
+
 		-
 			message: "#^Offset 'type' does not exist on array\\|null\\.$#"
 			count: 3
@@ -2290,6 +2295,11 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Reader/Xls.php
 
+		-
+			message: "#^Right side of && is always true\\.$#"
+			count: 1
+			path: src/PhpSpreadsheet/Reader/Xls.php
+
 		-
 			message: "#^Unreachable statement \\- code above always terminates\\.$#"
 			count: 8
@@ -3000,6 +3010,11 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Reader/Xlsx/SheetViewOptions.php
 
+		-
+			message: "#^Right side of && is always true\\.$#"
+			count: 1
+			path: src/PhpSpreadsheet/Reader/Xlsx/Styles.php
+
 		-
 			message: "#^Parameter \\#1 \\$haystack of function strpos expects string, string\\|false given\\.$#"
 			count: 1
@@ -4197,7 +4212,7 @@ parameters:
 
 		-
 			message: "#^Strict comparison using \\=\\=\\= between string and null will always evaluate to false\\.$#"
-			count: 1
+			count: 2
 			path: src/PhpSpreadsheet/Worksheet/Worksheet.php
 
 		-
@@ -5240,11 +5255,6 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
 
-		-
-			message: "#^Negated boolean expression is always false\\.$#"
-			count: 1
-			path: src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
-
 		-
 			message: "#^Parameter \\#2 \\$content of method XMLWriter\\:\\:writeElement\\(\\) expects string\\|null, int\\|string given\\.$#"
 			count: 1
@@ -5285,11 +5295,6 @@ parameters:
 			count: 1
 			path: src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
 
-		-
-			message: "#^Strict comparison using \\=\\=\\= between false and true will always evaluate to false\\.$#"
-			count: 2
-			path: src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
-
 		-
 			message: "#^Method PhpOffice\\\\PhpSpreadsheet\\\\Writer\\\\Xlsx\\\\Xlfn\\:\\:addXlfn\\(\\) should return string but returns string\\|null\\.$#"
 			count: 1

src/PhpSpreadsheet/Worksheet/Worksheet.php

@@ -3011,6 +3011,10 @@ class Worksheet implements IComparable
      */
     public static function extractSheetTitle($range, $returnRange = false)
     {
+        if ($range === null) {
+            return $returnRange ? [null, null] : null;
+        }
+
         // Sheet title included?
         if (($sep = strrpos($range, '!')) === false) {
             return $returnRange ? ['', $range] : '';