swift key crashing !

hello , community

I have been using swift key for 2 years now and it has never dissapointed me

recently after i upgraded from ios 10 to ios 11.3 i guess it is crashing and showing me an black screen

any explanations? why it is happening 

NOTE- i  restarted the phone

          i updated the app store

HELP!

nevermind! i got the solution

best regards-