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-rw-r--r--cpukit/posix/src/psignal.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/cpukit/posix/src/psignal.c b/cpukit/posix/src/psignal.c
index 62500ba4a5..a6c096caa7 100644
--- a/cpukit/posix/src/psignal.c
+++ b/cpukit/posix/src/psignal.c
@@ -108,6 +108,8 @@ void _POSIX_signals_Post_switch_extension(
ISR_Level level;
api = the_thread->API_Extensions[ THREAD_API_POSIX ];
+ if ( !api )
+ return;
/*
* If we invoke any user code, there is the possibility that