Syntax Error gets swallowed internally

[mattisebastian]

Hey,

First of all: thank you for your great project, it has been really helpful to me.
I have one specific problem:
Sometimes when I cause a syntax error, the console shows something like:

Warning: There is an internal error in the React performance measurement code. Did not expect componentDidMount timer to start while ctor timer is still in progress for another instance.
printWarning @ warning.js?85a7:36
warning @ warning.js?85a7:60
beginLifeCycleTimer @ ReactDebugTool.js?51ac:123
onBeginLifeCycleTimer @ ReactDebugTool.js?51ac:234
invokeComponentDidMountWithTimer @ ReactCompositeComponent.js?47a9:58
notifyAll @ CallbackQueue.js?fbdc:67
close @ ReactReconcileTransaction.js?51c1:81
closeAll @ Transaction.js?d39c:204
perform @ Transaction.js?d39c:146
batchedMountComponentIntoNode @ ReactMount.js?2450:127
perform @ Transaction.js?d39c:138
batchedUpdates @ ReactDefaultBatchingStrategy.js?c98c:63
batchedUpdates @ ReactUpdates.js?6ba9:98
_renderNewRootComponent @ ReactMount.js?2450:321
_renderSubtreeIntoContainer @ ReactMount.js?2450:402
render @ ReactMount.js?2450:423
(anonymous) @ client.js?cf27:99
F @ _export.js?cc6d:35
render @ client.js?cf27:97
_callee2$ @ index.js?a731:75
tryCatch @ runtime.js?1791:63
invoke @ runtime.js?1791:337
prototype.(anonymous function) @ runtime.js?1791:96
step @ asyncToGenerator.js?14e4:17
(anonymous) @ asyncToGenerator.js?14e4:28
ReactDOMComponentTree.js?8098:107 Uncaught TypeError: Cannot read property '__reactInternalInstance$fgm806fb7d5nc0nuqgu5l8fr' of null
    at Object.getClosestInstanceFromNode (eval at <anonymous> (main.js?dca12ad…:804), <anonymous>:107:11)
    at findParent (eval at <anonymous> (main.js?dca12ad…:8688), <anonymous>:39:32)
    at handleTopLevelImpl (eval at <anonymous> (main.js?dca12ad…:8688), <anonymous>:68:28)
    at ReactDefaultBatchingStrategyTransaction.perform (eval at <anonymous> (main.js?dca12ad…:1746), <anonymous>:138:20)
    at Object.batchedUpdates (eval at <anonymous> (main.js?dca12ad…:4332), <anonymous>:63:19)
    at Object.batchedUpdates (eval at <anonymous> (main.js?dca12ad…:1074), <anonymous>:98:20)
    at dispatchEvent (eval at <anonymous> (main.js?dca12ad…:8688), <anonymous>:150:20)```

Do you have any idea how to trace this back to the error in my actual code?