Cannot read property 'connectionId' of undefined

[vikasbiz4]

Hi,
I am developing a mobile application using opentok cordova. I have install opentok cordova plugin in my cordova android 7 ios app. Its working fine till now. When I publish first time every thing works fine. But next time I am getting issue while connecting opentok session.
Below are stack trace
processMessage failed: Error: TypeError: string is not a function cordova.js:1059
processMessage failed: Stack: TypeError: string is not a function
at TBSession.sessionConnected (file:///android_asset/www/opentok.js:698:23)
at TBSession.sessionConnected (file:///android_asset/www/opentok.js:477:59)
at TBSession.eventReceived (file:///android_asset/www/opentok.js:668:36)
at file:///android_asset/www/opentok.js:477:59
at Object.cordova.callbackFromNative (file:///android_asset/www/cordova.js:293:54)
at processMessage (file:///android_asset/www/cordova.js:1054:21)
at Function.androidExec.processMessages (file:///android_asset/www/cordova.js:1091:13)
at pollOnce (file:///android_asset/www/cordova.js:956:17)
at pollOnceFromOnlineEvent (file:///android_asset/www/cordova.js:946:5) cordova.js:1060
processMessage failed: Message: S11 OpenTokPlugin590010248 {"data":{"status":"connected","connection":{"data":"BC19E723-24B2-C3F1-E338-7580C0B916AB","creationTime":"Sun Apr 15 01:51:21 GMT+08:00 48362","connectionId":"8D2E3C14-71C4-46CF-A539-9536BCB58D4B"}},"eventType":"sessionConnected"} cordova.js:1061
JS Lib: session event received -
Object {data: Object, eventType: "connectionCreated"}
opentok.js:281
processMessage failed: Error: TypeError: string is not a function cordova.js:1059
processMessage failed: Stack: TypeError: string is not a function
at TBSession.connectionCreated (file:///android_asset/www/opentok.js:673:18)
at TBSession.connectionCreated (file:///android_asset/www/opentok.js:477:59)
at TBSession.eventReceived (file:///android_asset/www/opentok.js:668:36)
at file:///android_asset/www/opentok.js:477:59
at Object.cordova.callbackFromNative (file:///android_asset/www/cordova.js:293:54)
at processMessage (file:///android_asset/www/cordova.js:1054:21)
at Function.androidExec.processMessages (file:///android_asset/www/cordova.js:1091:13)
at pollOnce (file:///android_asset/www/cordova.js:956:17)
at pollOnceFromOnlineEvent (file:///android_asset/www/cordova.js:946:5)
Please help.