Messages not displaying in chatrooms

Good day, I use the free version of Wise Chat and only notice now the messages are not posting into the chatroom interface and admin channels also doesn’t show the last message posting time if this is a new chat room.

As I am new to the debug mode and only copy some of the error log, as the log continues to run without stopping and seems to repeat the same thing if I am not mistaken.
I have multiple chatrooms which are likely having the same issue. The following is the partial error log from one of the chat rooms, please advise:

2023-04-06 03:28:25 [debug] [engine.ajax.AjaxEngineMaintenance] [onMaintenanceRequestError] [errorThrown] {}
2023-04-06 03:28:25 [debug] [engine.ajax.AjaxEngineMaintenance] [onMaintenanceRequestError] [exception] “Unexpected token ‘<‘, \”<br />\n<b>\”… is not valid JSON”
2023-04-06 03:28:25 [error] Maintenance fatal error: SyntaxError: Unexpected token ‘<‘, “<br /> <b>”… is not valid JSON
2023-04-06 03:28:45 [debug] [engine.ajax.AjaxEngineMaintenance] [onMaintenanceRequestError] [responseText] “<br />\n<b>Notice</b>: Undefined property: stdClass::$avatar_url in <b>/home/rmituniversity/sasknn.ca/wp-content/plugins/wise-chat/src/dao/user/WiseChatUsersDAO.php</b> on line <b>314</b><br />\n<br />\n<b>Notice</b>: Undefined property: stdClass::$avatar_url in <b>/home/rmituniversity/sasknn.ca/wp-content/plugins/wise-chat/src/dao/user/WiseChatUsersDAO.php</b> on line <b>314</b><br />\n{\”events\”:[{\”name\”:\”publicChannels\”,\”data\”:[{\”id\”:\”NCtNdHdlUU1IdGQ3dGlHWURIWUJJQT09\”,\”readOnly\”:false,\”type\”:\”public\”,\”name\”:\”Driver’s Training Connect Service Group\”,\”avatar\”:\”https:\\/\\/www.sasknn.ca\\/wp-content\\/plugins\\/wise-chat\\/gfx\\/icons\\/public-channel.png\”,\”full\”:false,\”protected\”:false,\”authorized\”:true}]},{\”name\”:\”directChannels\”,\”data\”:[{\”id\”:\”U29pbUVTOE1lWjM2RjNhNEd5bVR5QT09\”,\”name\”:\”Jiaqi Sun\”,\”type\”:\”direct\”,\”readOnly\”:true,\”url\”:null,\”textColor\”:null,\”avatar\”:null,\”locked\”:true,\”classes\”:null,\”online\”:true,\”countryCode\”:null,\”country\”:null,\”city\”:null,\”countryFlagSrc\”:null}]},{\”name\”:\”onlineUsersCounter\”,\”data\”:1},{\”name\”:\”user\”,\”data\”:{\”id\”:\”WDN2YWpBVGxUT0s4RUp3S3NaUTRNdz09\”,\”cacheId\”:\”13395837f97b3ee2d4d0e3229a588d1dc424f394_WDN2YWpBVGxUT0s4RUp3S3NaUTRNdz09\”,\”name\”:\”Jiaqi Sun\”,\”settings\”:{\”enableNotifications\”:true,\”textColor\”:null,\”allowChangeTextColor\”:true,\”allowControlUserNotifications\”:false,\”allowMuteSound\”:false,\”allowChangeUserName\”:false,\”allowCustomize\”:true,\”muteSounds\”:false},\”rights\”:{\”deleteMessages\”:false,\”deleteOwnMessages\”:false,\”muteUsers\”:false,\”banUsers\”:false,\”spamReport\”:true}}},{\”name\”:\”auth\”,\”data\”:null},{\”name\”:\”checkSum\”,\”data\”:\”U0dGM1RUVjRibGhwVTJSRFJEZExXRGh2TDFnek5XeENhVk5RYlZVeFEybFROR0YxTkd4NlMwaFVjRXcyVERsWGVFdG1TVlVyZEROWGEyRmlVRlZ6YUZsc01rODNVbVpNT0hSeFJYQktkSGg1V1ZWdGFVc3hUVEEyU25wMWMwWXdhR05KTTFGR1ZHMWFSblJKVW5kSlRUVlFaa3AzVldRMVlVUkVSR0ZyYkZNdlQwcEtiSGRWU1ZnNGVtWklXakZRWW5weVpGTlJTVloyT1RVMk4wZDBNREEyY1haS1ZpOXhRVmRITWxBeGNVVTRWSEp1TTNCTlZXbG5MMGxvU25WblFrZzFSVFZoZVZjeVpuaHFWbkJ1TXpRM2F6UjJZakZGYjBSV1VrTlZNbkZGZUhCdU1USnFTbTExVVQwPQ==\”},{\”name\”:\”i18n\”,\”data\”:{\”unsupportedTypeOfFile\”:\”Unsupported type of file.\”,\”sizeLimitError\”:\”The size of the file exceeds allowed limit.\”,\”close\”:\”Close\”,\”ok\”:\”OK\”,\”yes\”:\”Yes\”,\”no\”:\”No\”,\”error\”:\”Error\”,\”information\”:\”Information\”,\”confirmation\”:\”Confirmation\”,\”enterYourUsername\”:\”Enter your username\”,\”enterPassword\”:\”Enter password\”,\”name\”:\”Name\”,\”save\”:\”Save\”,\”reset\”:\”Reset\”,\”muteSounds\”:\”Mute sounds\”,\”textColor\”:\”Text color\”,\”uploadPicture\”:\”Upload a picture\”,\”attachFile\”:\”Attach a file\”,\”insertEmoticon\”:\”Insert an emoticon\”,\”messageInputTitle\”:\”Use Shift+ENTER in order to move to the next line.\”,\”deleteMessage\”:\”Delete the message\”,\”banThisUser\”:\”Ban this user\”,\”muteThisUser\”:\”Mute this user\”,\”reportSpam\”:\”Report spam\”,\”deleteConfirmation\”:\”Are you sure you want to delete this message?\”,\”banConfirmation\”:\”Are you sure you want to ban this user?\”,\”banConfirmed\”:\”The user has been banned.\”,\”muteConfirmation\”:\”Are you sure you want to mute this user?\”,\”muteConfirmed\”:\”The user has been muted.\”,\”spamReportConfirmation\”:\”Are you sure you want to report the message as spam?\”,\”spamReportConfirmed\”:\”Thank you for reporting this.\”,\”subChannelsSearchHint\”:\”Search …\”,\”savedSettings\”:\”Settings have been saved.\”,\”maximize\”:\”Maximize\”,\”minimize\”:\”Minimize\”,\”chatFull\”:\”The chat is full now. Try again later.\”,\”onlineUsers\”:\”Online users\”}}],\”actions\”:[],\”lastActionId\”:88}”

The page I need help with: [log in to see the link]