Index: web/typo3/sysext/core/Classes/Utility/GeneralUtility.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- web/typo3/sysext/core/Classes/Utility/GeneralUtility.php	(date 1601020958864)
+++ web/typo3/sysext/core/Classes/Utility/GeneralUtility.php	(date 1601020958864)
@@ -2088,6 +2088,10 @@
                     if (!@is_file($filepath)) {
                         $errorMessage = 'The file was not written to the disk. Please, check that you have write permissions to the ' . $prefixLabel . ' directory.';
                         break;
+                    } else {
+                        //file was written successfully
+                        $errorMessage = null;
+                        break;
                     }
                 } else {
                     $errorMessage = 'Calculated file location didn\'t match input "' . $filepath . '".';