diff --git a/src/lib/plugins/placeBlock.js b/src/lib/plugins/placeBlock.js
index 691bc85..cac40fc 100644
--- a/src/lib/plugins/placeBlock.js
+++ b/src/lib/plugins/placeBlock.js
@@ -15,6 +15,7 @@ module.exports.player = function (player, serv, { version }) {
 
   player._client.on('block_place', ({ direction, location } = {}) => {
     const heldItem = player.inventory.slots[36 + player.heldItemSlot]
+    if (heldItem === undefined) return
     if (direction === -1 || heldItem.type === -1 || !blocks[heldItem.type]) return
     const referencePosition = new Vec3(location.x, location.y, location.z)
     const directionVector = directionToVector[direction]
diff --git a/src/lib/plugins/useItem.js b/src/lib/plugins/useItem.js
index d327674..bfcdfef 100644
--- a/src/lib/plugins/useItem.js
+++ b/src/lib/plugins/useItem.js
@@ -5,6 +5,7 @@ module.exports.player = function (player, serv, { version }) {
 
   player._client.on('block_place', ({ direction, location } = {}) => {
     const heldItem = player.inventory.slots[36 + player.heldItemSlot]
+    if (heldItem === undefined) return
     if (direction === -1 || heldItem.type === -1 || !items[heldItem.type]) return
     const item = heldItem
     const referencePosition = new Vec3(location.x, location.y, location.z)