Trying to debug this crash where none of my files are in the

Question

Trying to debug this crash where none of my files are in the stacktrace see thread The only hint is the presence `androidx compose ui platform AndroidUiDispatcher` Does this maybe mean that the crash happens in a compose effect Or any other implication that could help debugging

natario1 · Answer

```2022 05 03 10 40 07 110 E AndroidRuntime FATAL EXCEPTION main Process <http my app|my app> PID 32505 java util NoSuchElementException Expected at least one element at kotlinx coroutines flow FlowKt ReduceKt first Reduce kt 96 at kotlinx coroutines flow FlowKt first Unknown Source 1 at kotlinx coroutines flow FlowKt ReduceKt$first$1 invokeSuspend Unknown Source 13 at kotlin coroutines jvm internal BaseContinuationImpl resumeWith ContinuationImpl kt 33 at kotlinx coroutines internal ScopeCoroutine afterResume Scopes kt 33 at kotlinx coroutines AbstractCoroutine resumeWith AbstractCoroutine kt 102 at kotlin coroutines jvm internal BaseContinuationImpl resumeWith ContinuationImpl kt 46 at kotlinx coroutines DispatchedTask run DispatchedTask kt 106 at androidx compose ui platform AndroidUiDispatcher performTrampolineDispatch AndroidUiDispatcher android kt 81 at androidx compose ui platform AndroidUiDispatcher access$performTrampolineDispatch AndroidUiDispatcher android kt 41 at androidx compose ui platform AndroidUiDispatcher$dispatchCallback$1 run AndroidUiDispatcher android kt 57 at android os Handler handleCallback Handler java 938 at android os Handler dispatchMessage Handler java 99 at android os Looper loopOnce Looper java 201 at android os Looper loop Looper java 288 at android app ActivityThread main ActivityThread java 7870 at java lang reflect Method invoke Native Method at com android internal os RuntimeInit$MethodAndArgsCaller run RuntimeInit java 548 at com android internal os ZygoteInit main ZygoteInit java 1003 ```

Rob · Answer

Look for where you re calling first on a Flow The flow is not emitting any elements before completing

Rob · Answer

Or actually it might be reduce

natario1 · Answer

Well I m calling first in hundreds of places so if I could scope the issue down first for example to compose effects that would be great Not using reduce at all

Rob · Answer

From what I can tell something is calling ` reduce ` on a `Flow lt T gt ` Maybe you re calling a library function that is using ` reduce `

reformator · Answer

Maybe <https github com Anamorphosee stacktrace decoroutinator> can help you to get more detailed stacktrace