diff --git a/paper-api/src/main/java/org/bukkit/util/BlockIterator.java b/paper-api/src/main/java/org/bukkit/util/BlockIterator.java
index 8a377e1413..0cf54e89ed 100644
--- a/paper-api/src/main/java/org/bukkit/util/BlockIterator.java
+++ b/paper-api/src/main/java/org/bukkit/util/BlockIterator.java
@@ -1,6 +1,7 @@
 package org.bukkit.util;
 
 import static org.bukkit.util.NumberConversions.*;
+import com.google.common.base.Preconditions;
 import java.util.Iterator;
 import java.util.NoSuchElementException;
 import org.bukkit.Location;
@@ -53,6 +54,11 @@ public class BlockIterator implements Iterator<Block> {
      *
      */
     public BlockIterator(@NotNull World world, @NotNull Vector start, @NotNull Vector direction, double yOffset, int maxDistance) {
+        Preconditions.checkArgument(world != null, "world must not be null");
+        Preconditions.checkArgument(start != null, "start must not be null");
+        Preconditions.checkArgument(direction != null, "direction must not be null");
+        Preconditions.checkArgument(!direction.isZero(), "direction must have at least one non-zero component");
+
         this.world = world;
         this.maxDistance = maxDistance;
 
diff --git a/paper-api/src/main/java/org/bukkit/util/Vector.java b/paper-api/src/main/java/org/bukkit/util/Vector.java
index bdfb9623b7..abd5b815e9 100644
--- a/paper-api/src/main/java/org/bukkit/util/Vector.java
+++ b/paper-api/src/main/java/org/bukkit/util/Vector.java
@@ -365,6 +365,15 @@ public class Vector implements Cloneable, ConfigurationSerializable {
         return this;
     }
 
+    /**
+     * Check whether or not each component of this vector is equal to 0.
+     *
+     * @return true if equal to zero, false if at least one component is non-zero
+     */
+    public boolean isZero() {
+        return x == 0 && y == 0 && z == 0;
+    }
+
     /**
      * Converts each component of value <code>-0.0</code> to <code>0.0</code>.
      *
diff --git a/paper-api/src/test/java/org/bukkit/util/VectorTest.java b/paper-api/src/test/java/org/bukkit/util/VectorTest.java
index 9b846deba8..03442bfff0 100644
--- a/paper-api/src/test/java/org/bukkit/util/VectorTest.java
+++ b/paper-api/src/test/java/org/bukkit/util/VectorTest.java
@@ -122,4 +122,14 @@ public class VectorTest {
 
         assertTrue(Double.isFinite(a.angle(b)));
     }
+
+    @Test
+    public void testIsZero() {
+        assertTrue(new Vector().isZero());
+        assertTrue(new Vector(0, 0, 0).isZero());
+
+        Vector vector = new Vector(1, 2, 3);
+        vector.zero();
+        assertTrue(vector.isZero());
+    }
 }