diff --git a/include/freerdp/utils/smartcard_call.h b/include/freerdp/utils/smartcard_call.h
index 2589cadab..166b737b5 100644
--- a/include/freerdp/utils/smartcard_call.h
+++ b/include/freerdp/utils/smartcard_call.h
@@ -44,6 +44,13 @@ extern "C"
 	WINPR_ATTR_NODISCARD
 	FREERDP_API scard_call_context* smartcard_call_context_new(const rdpSettings* settings);
 
+	/** @brief send a stop signal (or reset it if \b reset is \b TRUE) to a \ref scard_call_context
+	 *
+	 *  @param ctx The context to send the signal to. Must not be \b nullptr
+	 *  @param reset Set or reset the signal
+	 *
+	 *  @return \b TRUE for success, \b FALSE otherwise.
+	 */
 	FREERDP_API BOOL smartcard_call_context_signal_stop(scard_call_context* ctx, BOOL reset);
 
 	WINPR_ATTR_NODISCARD
diff --git a/libfreerdp/utils/smartcard_call.c b/libfreerdp/utils/smartcard_call.c
index b1c3ae7af..7c1d966b6 100644
--- a/libfreerdp/utils/smartcard_call.c
+++ b/libfreerdp/utils/smartcard_call.c
@@ -2051,7 +2051,8 @@ BOOL smartcard_call_release_context(scard_call_context* ctx, SCARDCONTEXT hConte
 
 BOOL smartcard_call_cancel_all_context(scard_call_context* ctx)
 {
-	WINPR_ASSERT(ctx);
+	if (!ctx)
+		return FALSE;
 
 	smartcard_call_context_signal_stop(ctx, FALSE);
 	HashTable_Clear(ctx->rgSCardContextList);
@@ -2094,6 +2095,7 @@ BOOL smartcard_call_is_configured(scard_call_context* ctx)
 BOOL smartcard_call_context_signal_stop(scard_call_context* ctx, BOOL reset)
 {
 	WINPR_ASSERT(ctx);
+
 	if (!ctx->stopEvent)
 		return TRUE;
 
diff --git a/server/proxy/channels/pf_channel_smartcard.c b/server/proxy/channels/pf_channel_smartcard.c
index 1b9a60a62..9dc1ee269 100644
--- a/server/proxy/channels/pf_channel_smartcard.c
+++ b/server/proxy/channels/pf_channel_smartcard.c
@@ -271,7 +271,8 @@ BOOL pf_channel_smartcard_server_handle(WINPR_ATTR_UNUSED pServerContext* ps,
 static void channel_stop_and_wait(pf_channel_client_context* scard, BOOL reset)
 {
 	WINPR_ASSERT(scard);
-	smartcard_call_context_signal_stop(scard->callctx, FALSE);
+	if (scard->callctx)
+		smartcard_call_context_signal_stop(scard->callctx, FALSE);
 
 	while (ArrayList_Count(scard->workObjects) > 0)
 	{
@@ -281,7 +282,8 @@ static void channel_stop_and_wait(pf_channel_client_context* scard, BOOL reset)
 		WaitForThreadpoolWorkCallbacks(work, TRUE);
 	}
 
-	smartcard_call_context_signal_stop(scard->callctx, reset);
+	if (scard->callctx)
+		smartcard_call_context_signal_stop(scard->callctx, reset);
 }
 
 static void pf_channel_scard_client_context_free(InterceptContextMapEntry* base)