diff --git a/src/shaders/water.glsl b/src/shaders/water.glsl
index d02c291..e165548 100644
--- a/src/shaders/water.glsl
+++ b/src/shaders/water.glsl
@@ -165,6 +165,7 @@ uniform sampler2D sNormal;
 	vec4 caustics() {
 		float rOldArea = length(dFdx(vOldPos.xyz)) * length(dFdy(vOldPos.xyz));
 		float rNewArea = length(dFdx(vNewPos.xyz)) * length(dFdy(vNewPos.xyz));
+		rNewArea = max(rNewArea, 0.00002);
 		float value = clamp(rOldArea / rNewArea * 0.2, 0.0, 1.0) * vOldPos.w;
 		return vec4(value, 0.0, 0.0, 0.0);
 	}