3 files changed, 18 insertions, 4 deletions
diff --git a/engines/sky/grid.cpp b/engines/sky/grid.cpp
index d9b7a17351..7b473c7934 100644
--- a/engines/sky/grid.cpp
+++ b/engines/sky/grid.cpp
@@ -255,8 +255,10 @@ void Grid::removeGrid(uint32 x, uint32 y, uint32 width, Compact *cpt) {
 }
 
 uint8 *Grid::giveGrid(uint32 pScreen) {
-	assert((_gridConvertTable[pScreen] >= 0) && (_gridConvertTable[pScreen] < TOT_NO_GRIDS));
-	return _gameGrids[_gridConvertTable[pScreen]];
+	if ((_gridConvertTable[pScreen] >= 0) && (_gridConvertTable[pScreen] < TOT_NO_GRIDS)) {
+		return _gameGrids[_gridConvertTable[pScreen]];
+	}
+	return 0;
 }
 
 } // End of namespace Sky
diff --git a/engines/sky/logic.cpp b/engines/sky/logic.cpp
index ccfbfbbd62..991fbe19d0 100644
--- a/engines/sky/logic.cpp
+++ b/engines/sky/logic.cpp
@@ -1702,6 +1702,15 @@ bool Logic::fnQuit(uint32 a, uint32 b, uint32 c) {
 }
 
 bool Logic::fnSpeakMe(uint32 targetId, uint32 mesgNum, uint32 animNum) {
+	/* WORKAROUND for #2687172: When Mrs. Piermont is talking
+	   on the phone in her apartment, ignore her fnSpeakMe calls
+	   on other screens, as the lack of speech files for these lines
+	   will cause Foster's speech to be aborted if the timing is bad.
+	*/
+	if (targetId == 0x4039 && animNum == 0x9B && Logic::_scriptVariables[SCREEN] != 38) {
+		return false;
+	}
+
 	stdSpeak(_skyCompact->fetchCpt(targetId), mesgNum, animNum, 0);
 	return false;	//drop out of script
 }
diff --git a/engines/sky/sky.cpp b/engines/sky/sky.cpp
index 47cc65e96d..e85da6297a 100644
--- a/engines/sky/sky.cpp
+++ b/engines/sky/sky.cpp
@@ -208,8 +208,11 @@ Common::Error SkyEngine::go() {
 		_skyScreen->recreate();
 		_skyScreen->spriteEngine();
 		if (_debugger->showGrid()) {
-			_skyScreen->showGrid(_skyLogic->_skyGrid->giveGrid(Logic::_scriptVariables[SCREEN]));
-			_skyScreen->forceRefresh();
+			uint8 *grid = _skyLogic->_skyGrid->giveGrid(Logic::_scriptVariables[SCREEN]);
+			if (grid) {
+				_skyScreen->showGrid(grid);
+				_skyScreen->forceRefresh();
+			}
 		}
 		_skyScreen->flip();