<h4>Chat Module Bug Fixes</h4><ul><li><strong>Fixed:</strong> $.each crash on undefined result.messages in displayChatMessage — when no chat history exists, result.messages is undefined. Added null guard to show "No messages yet" instead of crashing.</li><li><strong>Fixed:</strong> MySQL "Incorrect integer value" error on createMessage — User.class.php identifyIfUserOrCompany() returned empty string for company account id field, causing insert failure on int NOT NULL column. Changed to return 0 for company accounts and added null guard for missing accounts.</li><li><strong>Fixed:</strong> "Trying to access array offset on bool" warning on ChatModuleController line 570 — end($get_status) returns false when array is empty, then code tried to access ["msg_id"] on false. Added null check.</li><li><strong>Fixed:</strong> Undefined array key "msg" warning on ChatModuleController line 810 — htmlentities() received null when msg key missing from request. Added null coalescing operator.</li><li><strong>Fixed:</strong> JSON.parse error on chat send — controller can return PHP errors as HTML which breaks JSON.parse(). Added try/catch with safe type checking.</li></ul>