diff --git a/Scripts/UIParticleUpdater.cs b/Scripts/UIParticleUpdater.cs
index 0f78156..1428407 100755
--- a/Scripts/UIParticleUpdater.cs
+++ b/Scripts/UIParticleUpdater.cs
@@ -164,6 +164,8 @@ namespace Coffee.UIExtensions
                 // No particle to render.
                 var currentPs = particle.particles[i];
                 if (!currentPs || !currentPs.IsAlive() || currentPs.particleCount == 0) continue;
+                var r = currentPs.GetComponent<ParticleSystemRenderer>();
+                if (!r.sharedMaterial && !r.trailMaterial) continue;
 
                 // Calc matrix.
                 Profiler.BeginSample("[UIParticle] Bake Mesh > Calc matrix");
@@ -218,7 +220,6 @@ namespace Coffee.UIExtensions
 #endif
 
                 // Bake main particles.
-                var r = currentPs.GetComponent<ParticleSystemRenderer>();
                 if (CanBakeMesh(r))
                 {
                     Profiler.BeginSample("[UIParticle] Bake Mesh > Bake Main Particles");
diff --git a/Scripts/Utils.cs b/Scripts/Utils.cs
index ebc4278..87e9fa5 100644
--- a/Scripts/Utils.cs
+++ b/Scripts/Utils.cs
@@ -194,8 +194,12 @@ namespace Coffee.UIParticleExtensions
                 var bRenderer = b.GetComponent<ParticleSystemRenderer>();
 
                 // Render queue: ascending
-                var aMat = aRenderer.sharedMaterial;
-                var bMat = bRenderer.sharedMaterial;
+                var aMat = aRenderer.sharedMaterial ?? aRenderer.trailMaterial;
+                var bMat = bRenderer.sharedMaterial ?? bRenderer.trailMaterial;
+                if (!aMat && !bMat) return 0;
+                if (!aMat) return -1;
+                if (!bMat) return 1;
+
                 if (aMat.renderQueue != bMat.renderQueue)
                     return aMat.renderQueue - bMat.renderQueue;