Avoid infinite loop in getFlatIcon

Since I did it on tg anyway

code/__HELPERS/icons.dm

@@ -107,7 +107,7 @@ AngleToHue(hue)
     Converts an angle to a hue in the valid range.
 RotateHue(hsv, angle)
     Takes an HSV or HSVA value and rotates the hue forward through red, green, and blue by an angle from 0 to 360.
-    (Rotating red by 60° produces yellow.) The result is another HSV or HSVA color with the same saturation and value
+    (Rotating red by 60° produces yellow.) The result is another HSV or HSVA color with the same saturation and value
     as the original, but a different hue.
 GrayScale(rgb)
     Takes an RGB or RGBA color and converts it to grayscale. Returns an RGB or RGBA string.
@@ -699,7 +699,9 @@ proc // Creates a single icon from a given /atom or /image.  Only the first argu
 		while(TRUE)
 			if(curIndex<=process.len)
 				current = process[curIndex]
-				if(!current)	continue
+				if(!current)	
+					curIndex++ //Skip this bad layer item
+					continue
 				currentLayer = current:layer
 				if(currentLayer<0) // Special case for FLY_LAYER
 					if(currentLayer <= -1000) return flat