iOS Xamarin C# App bug fix

Hello,
need iOS Xamarin expert to fix an error that cause the app crash over TestFlight.

"exception" : {"codes":"0x0000000000000000, 0x0000000000000000","rawCodes":[0,0],"type":"EXC_CRASH","signal":"SIGABRT"},
"ktriageinfo" : "VM - Fault hit memory shortage\n",
"asi" : {"libsystem_c.dylib":["abort() called"]},

Logs from Apple attached