diff --git a/intern/cycles/kernel/closure/bsdf_principled_hair_huang.h b/intern/cycles/kernel/closure/bsdf_principled_hair_huang.h
index 4dbe44dfafa..4076218257e 100644
--- a/intern/cycles/kernel/closure/bsdf_principled_hair_huang.h
+++ b/intern/cycles/kernel/closure/bsdf_principled_hair_huang.h
@@ -856,6 +856,14 @@ ccl_device Spectrum bsdf_hair_huang_eval(KernelGlobals kg,
   bsdf->extra->gamma_m_min = gamma_m_min;
   bsdf->extra->gamma_m_max = gamma_m_max;
 
+  /* FIXME(weizhen): There is a problem of `fast_sinf(-1.57085085f)` returning 0 instead of
+   * expected -1, causing the range to be incorrect. As that seems an uncommon case, it feels safer
+   * to cover this case first, and look into solving the problem in `fast_sinf()` later. */
+  kernel_assert(bsdf->extra->gamma_m_min < bsdf->extra->gamma_m_max);
+  if (!(bsdf->extra->gamma_m_min < bsdf->extra->gamma_m_max)) {
+    return zero_spectrum();
+  }
+
   const float projected_area = cos_theta(local_I) * dh;
 
   return (bsdf_hair_huang_eval_r(kg, sc, local_I, local_O) +