diff --git a/libfreerdp/core/freerdp.c b/libfreerdp/core/freerdp.c
index e862f73ea..a87c04dcf 100644
--- a/libfreerdp/core/freerdp.c
+++ b/libfreerdp/core/freerdp.c
@@ -558,7 +558,12 @@ BOOL freerdp_focus_required(freerdp* instance)
 {
 	rdpRdp* rdp;
 	BOOL bRetCode = FALSE;
+
+	WINPR_ASSERT(instance);
+	WINPR_ASSERT(instance->context);
+
 	rdp = instance->context->rdp;
+	WINPR_ASSERT(rdp);
 
 	if (rdp->resendFocus)
 	{
@@ -572,7 +577,13 @@ BOOL freerdp_focus_required(freerdp* instance)
 void freerdp_set_focus(freerdp* instance)
 {
 	rdpRdp* rdp;
+
+	WINPR_ASSERT(instance);
+	WINPR_ASSERT(instance->context);
+
 	rdp = instance->context->rdp;
+	WINPR_ASSERT(rdp);
+
 	rdp->resendFocus = TRUE;
 }
 
@@ -787,11 +798,15 @@ void freerdp_context_free(freerdp* instance)
 
 int freerdp_get_disconnect_ultimatum(rdpContext* context)
 {
+	WINPR_ASSERT(context);
 	return context->disconnectUltimatum;
 }
 
 UINT32 freerdp_error_info(freerdp* instance)
 {
+	WINPR_ASSERT(instance);
+	WINPR_ASSERT(instance->context);
+	WINPR_ASSERT(instance->context->rdp);
 	return instance->context->rdp->errorInfo;
 }
 
@@ -813,6 +828,7 @@ BOOL freerdp_send_error_info(rdpRdp* rdp)
 
 UINT32 freerdp_get_last_error(rdpContext* context)
 {
+	WINPR_ASSERT(context);
 	return context->LastError;
 }
 
@@ -908,6 +924,8 @@ void freerdp_set_last_error(rdpContext* context, UINT32 lastError)
 void freerdp_set_last_error_ex(rdpContext* context, UINT32 lastError, const char* fkt,
                                const char* file, int line)
 {
+	WINPR_ASSERT(context);
+
 	if (lastError)
 		WLog_ERR(TAG, "%s:%s %s [0x%08" PRIX32 "]", fkt, __FUNCTION__,
 		         freerdp_get_last_error_name(lastError), lastError);
@@ -1044,11 +1062,14 @@ BOOL freerdp_nla_revert_to_self(rdpContext* context)
 
 HANDLE getChannelErrorEventHandle(rdpContext* context)
 {
+	WINPR_ASSERT(context);
 	return context->channelErrorEvent;
 }
 
 BOOL checkChannelErrorEvent(rdpContext* context)
 {
+	WINPR_ASSERT(context);
+
 	if (WaitForSingleObject(context->channelErrorEvent, 0) == WAIT_OBJECT_0)
 	{
 		WLog_ERR(TAG, "%s. Error was %" PRIu32 "", context->errorDescription,
@@ -1066,16 +1087,19 @@ BOOL checkChannelErrorEvent(rdpContext* context)
  */
 UINT getChannelError(rdpContext* context)
 {
+	WINPR_ASSERT(context);
 	return context->channelErrorNum;
 }
 
 const char* getChannelErrorDescription(rdpContext* context)
 {
+	WINPR_ASSERT(context);
 	return context->errorDescription;
 }
 
 void clearChannelError(rdpContext* context)
 {
+	WINPR_ASSERT(context);
 	context->channelErrorNum = 0;
 	memset(context->errorDescription, 0, 500);
 	ResetEvent(context->channelErrorEvent);
@@ -1085,6 +1109,9 @@ void setChannelError(rdpContext* context, UINT errorNum, const char* format, ...
 {
 	va_list ap;
 	va_start(ap, format);
+
+	WINPR_ASSERT(context);
+
 	context->channelErrorNum = errorNum;
 	vsnprintf(context->errorDescription, 499, format, ap);
 	va_end(ap);