diff --git a/common/src/main/kotlin/quaedam/projection/swarm/SwarmProjectionEffect.kt b/common/src/main/kotlin/quaedam/projection/swarm/SwarmProjectionEffect.kt
index ec3b66d..2296ac4 100644
--- a/common/src/main/kotlin/quaedam/projection/swarm/SwarmProjectionEffect.kt
+++ b/common/src/main/kotlin/quaedam/projection/swarm/SwarmProjectionEffect.kt
@@ -40,6 +40,10 @@ data class SwarmProjectionEffect(
                     level.random.nextInt(area.minZ(), area.maxZ()),
                 )
                 spawnPos = spawnPos.atY(level.getHeight(Heightmap.Types.WORLD_SURFACE, spawnPos.x, spawnPos.z))
+                if (level.getBlockState(spawnPos.below()).isAir)
+                    return
+                if (!level.getBlockState(spawnPos).isAir)
+                    return
                 ProjectedPersonEntity.entity.get().spawn(level, spawnPos, MobSpawnType.TRIGGERED)
             }
         }