Fix small issue in DBDebug

Did not work for helper functions like array_map - also added
explanation in code comment.

Author: iquito

.gitattributes

@@ -1,7 +1,10 @@
 /tests              export-ignore
 /.gitattributes     export-ignore
 /.gitignore         export-ignore
-/phpunit.xml        export-ignore
-/phpcs.xml          export-ignore
+/phpunit.xml.dist   export-ignore
+/phpcs.xml.dist     export-ignore
 /captainhook.json   export-ignore
-/.travis.yml        export-ignore
+/.travis.yml        export-ignore
+/ruleset.xml        export-ignore
+/.editorconfig      export-ignore
+/phpstan.neon       export-ignore

phpunit.xml.dist

@@ -18,6 +18,7 @@
             <directory suffix=".php">src</directory>
             <exclude>
                 <directory>src/TestHelpers</directory>
+                <directory>src/DBDebug.php</directory>
             </exclude>
         </whitelist>
     </filter>

src/DBDebug.php

@@ -32,6 +32,12 @@ public static function createException(string $exceptionClass, $backtraceClasses
 
         // Go through backtrace and find the topmost caller
         foreach ($backtraceList as $backtrace) {
+            // We are only going through classes - this is necessary because of
+            // helper functions like array_map, which otherwise come up in the backtrace
+            if (!isset($backtrace['class'])) {
+                continue;
+            }
+
             // Replace backtrace instance if we find a valid class insance
             foreach ($backtraceClasses as $backtraceClass) {
                 // Check if the class or interface we are looking for is implemented or used