[BUGFIX] Added strict type check to condition

extensions/karma/Classes/Utility/UserProfileChangeKarmaIssuer.php

@@ -116,7 +116,7 @@ class UserProfileChangeKarmaIssuer
     {
         $karmaSourceCode = $this->settings['userProfileChangeKarmaIssuer']['newUserWasCreated']['sourceCode'];
 
-        if ($karmaSourceCode == '') {
+        if ($karmaSourceCode === '') {
             throw new \Exception('Empty karma source code supplied. Please configure it in TypoScript.', 1541508560);
         }