From 39dbbeccf55f953f975f61888dccfb2d14382f79 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sun, 8 Dec 2019 20:29:06 +0100
Subject: Cleanup: Fix potential null dereferences

---
 src/server/events/Delta.cpp | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

(limited to 'src/server')

diff --git a/src/server/events/Delta.cpp b/src/server/events/Delta.cpp
index 3fb60bfe..0a7b05ea 100644
--- a/src/server/events/Delta.cpp
+++ b/src/server/events/Delta.cpp
@@ -525,15 +525,18 @@ Delta::execute(RunContext& context)
 			}
 			break;
 		case SpecialType::POLYPHONIC: {
-			GraphImpl* parent = reinterpret_cast<GraphImpl*>(object->parent());
-			if (value.get<int32_t>()) {
-				object->apply_poly(context, parent->internal_poly_process());
-			} else {
-				object->apply_poly(context, 1);
+			if (object) {
+				if (value.get<int32_t>()) {
+					auto* parent = reinterpret_cast<GraphImpl*>(object->parent());
+					object->apply_poly(context, parent->internal_poly_process());
+				} else {
+					object->apply_poly(context, 1);
+				}
 			}
 		} break;
 		case SpecialType::POLYPHONY:
-			if (!_graph->apply_internal_poly(context,
+			if (_graph &&
+			    !_graph->apply_internal_poly(context,
 			                                 *_engine.buffer_factory(),
 			                                 *_engine.maid(),
 			                                 value.get<int32_t>())) {
@@ -557,7 +560,9 @@ Delta::execute(RunContext& context)
 			}
 			break;
         case SpecialType::PRESET:
-	        block->set_enabled(false);
+	        if (block) {
+		        block->set_enabled(false);
+	        }
 			break;
 		case SpecialType::NONE:
 			if (port) {
-- 
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