diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index f9333d935..3b055a5ea 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -345,11 +345,6 @@ parameters:
 			count: 1
 			path: src/Twig/SourceCodeExtension.php
 
-		-
-			message: "#^Parameter \\#1 \\$array of function array_slice expects array, array\\<int, string\\>\\|false given\\.$#"
-			count: 1
-			path: src/Twig/SourceCodeExtension.php
-
 		-
 			message: "#^Parameter \\#1 \\$filename of function file expects string, string\\|false given\\.$#"
 			count: 1
diff --git a/src/Twig/SourceCodeExtension.php b/src/Twig/SourceCodeExtension.php
index ff2145a5d..e3a4b2028 100644
--- a/src/Twig/SourceCodeExtension.php
+++ b/src/Twig/SourceCodeExtension.php
@@ -65,7 +65,9 @@ private function getController(): ?array
 
         $method = $this->getCallableReflector($this->controller);
 
-        $classCode = file($method->getFileName());
+        if (false === $classCode = file($method->getFileName())) {
+            throw new \LogicException(sprintf('There was an error while trying to read the contents of the "%s" file.', $method->getFileName()));
+        }
 
         $startLine = $method->getStartLine() - 1;
         $endLine = $method->getEndLine();