prevent null read

Author: leo4life2

lib/plugins/physics.js

@@ -295,13 +295,22 @@ function inject (bot, { physicsEnabled, maxCatchupTicks }) {
   bot._client.on('explosion', explosion => {
     // TODO: emit an explosion event with more info
     if (bot.physicsEnabled && bot.game.gameMode !== 'creative') {
-      if (explosion.playerKnockback) { // 1.21.3+
-        bot.entity.velocity.add(explosion.playerMotionX, explosion.playerMotionY, explosion.playerMotionZ)
-      }
-      if ('playerMotionX' in explosion) {
-        bot.entity.velocity.x += explosion.playerMotionX
-        bot.entity.velocity.y += explosion.playerMotionY
-        bot.entity.velocity.z += explosion.playerMotionZ
+      // Check if playerMotion properties exist and are numbers before using them
+      const motionX = explosion.playerMotionX;
+      const motionY = explosion.playerMotionY;
+      const motionZ = explosion.playerMotionZ;
+      const hasMotion = typeof motionX === 'number' && typeof motionY === 'number' && typeof motionZ === 'number';
+
+      if (hasMotion) {
+          if (explosion.playerKnockback) { // 1.21.3+ - Note: This might be redundant if playerKnockback already implies motion exists. Added check for safety.
+            bot.entity.velocity.add(motionX, motionY, motionZ)
+          } else if ('playerMotionX' in explosion) { // Older versions check
+            bot.entity.velocity.x += motionX
+            bot.entity.velocity.y += motionY
+            bot.entity.velocity.z += motionZ
+          }
+      } else {
+        console.warn('Received explosion packet with missing or invalid playerMotion data. Skipping velocity update.');
       }
     }
   })