diff --git a/OpenRA.Mods.Common/SpriteLoaders/PngSheetLoader.cs b/OpenRA.Mods.Common/SpriteLoaders/PngSheetLoader.cs
index a88e2ccbe5..6b4f19158a 100644
--- a/OpenRA.Mods.Common/SpriteLoaders/PngSheetLoader.cs
+++ b/OpenRA.Mods.Common/SpriteLoaders/PngSheetLoader.cs
@@ -96,13 +96,18 @@ namespace OpenRA.Mods.Common.SpriteLoaders
 		{
 			regions = new List<Rectangle>();
 			offsets = new List<float2>();
+			var pngRectangle = new Rectangle(0, 0, png.Width, png.Height);
 
 			string frame;
 			for (var i = 0; png.EmbeddedData.TryGetValue("Frame[" + i + "]", out frame); i++)
 			{
 				// Format: x,y,width,height;offsetX,offsetY
 				var coords = frame.Split(';');
-				regions.Add(FieldLoader.GetValue<Rectangle>("Region", coords[0]));
+				var region = FieldLoader.GetValue<Rectangle>("Region", coords[0]);
+				if (!pngRectangle.Contains(region))
+					throw new InvalidDataException("Invalid frame regions {0} defined.".F(region));
+
+				regions.Add(region);
 				offsets.Add(FieldLoader.GetValue<float2>("Offset", coords[1]));
 			}
 		}
@@ -141,6 +146,10 @@ namespace OpenRA.Mods.Common.SpriteLoaders
 
 			var framesPerRow = png.Width / frameSize.Width;
 
+			var rows = (frameAmount + framesPerRow - 1) / framesPerRow;
+			if (png.Width < frameSize.Width * frameAmount / rows || png.Height < frameSize.Height * rows)
+				throw new InvalidDataException("Invalid frame size {0} and frame amount {1} defined.".F(frameSize, frameAmount));
+
 			regions = new List<Rectangle>();
 			offsets = new List<float2>();