Rewritten. Works as a charm now.

resources/Shaders/ForwardPlusShieldCheck.frag.glsl

@@ -1,6 +1,7 @@
 #version 430
 
 #define MIN_AMBIENT_LIGHT 0.3
+#define MAX_SPLITS 4
 
 uniform mat4 M;
 uniform mat4 V;
@@ -69,6 +70,7 @@ in VertexData{
 	vec2 TextureCoordinate;
 	vec4 ExplosionColor;
 	float ExplosionPercentageElapsed;
+	vec4 PositionLightSpace[MAX_SPLITS];
 }Input;
 
 out vec4 sceneColor;