diff --git a/src/hostapi/wasapi/pa_win_wasapi.c b/src/hostapi/wasapi/pa_win_wasapi.c
index 36abc07..20b49f6 100644
--- a/src/hostapi/wasapi/pa_win_wasapi.c
+++ b/src/hostapi/wasapi/pa_win_wasapi.c
@@ -2462,7 +2462,7 @@ static PaError GetClosestFormat(IAudioClient *client, double sampleRate, const P
 	WAVEFORMATEX *sharedClosestMatch = NULL;
 	HRESULT hr                       = !S_OK;
 	PaStreamParameters params        = (*_params);
-	const BOOL explicitFormat        = ((streamInfo->flags & paWinWasapiExplicitSampleFormat) == paWinWasapiExplicitSampleFormat);
+	const BOOL explicitFormat        = (streamInfo != NULL) && ((streamInfo->flags & paWinWasapiExplicitSampleFormat) == paWinWasapiExplicitSampleFormat);
 	(void)output;
 
 	/* It was not noticed that 24-bit Input producing no output while device accepts this format.