diff --git a/src/errors/Messages.js b/src/errors/Messages.js
index cbf4016a6..9f0f6e44f 100644
--- a/src/errors/Messages.js
+++ b/src/errors/Messages.js
@@ -23,9 +23,11 @@ const Messages = {
   SHARDING_IN_PROCESS: 'Shards are still being spawned.',
   SHARDING_ALREADY_SPAWNED: count => `Already spawned ${count} shards.`,
   SHARDING_PROCESS_EXISTS: id => `Shard ${id} already has an active process.`,
+  SHARDING_WORKER_EXISTS: id => `Shard ${id} already has an active worker.`,
   SHARDING_READY_TIMEOUT: id => `Shard ${id}'s Client took too long to become ready.`,
   SHARDING_READY_DISCONNECTED: id => `Shard ${id}'s Client disconnected before becoming ready.`,
   SHARDING_READY_DIED: id => `Shard ${id}'s process exited before its Client became ready.`,
+  SHARDING_NO_CHILD_EXISTS: id => `Shard ${id} has no active process or worker.`,
 
   COLOR_RANGE: 'Color must be within the range 0 - 16777215 (0xFFFFFF).',
   COLOR_CONVERT: 'Unable to convert color to a number.',
diff --git a/src/sharding/Shard.js b/src/sharding/Shard.js
index 3ef8b9ba0..797dde50f 100644
--- a/src/sharding/Shard.js
+++ b/src/sharding/Shard.js
@@ -124,6 +124,9 @@ class Shard extends EventEmitter {
         .on('exit', this._exitListener);
     }
 
+    this._evals.clear();
+    this._fetches.clear();
+
     /**
      * Emitted upon the creation of the shard's child process/worker.
      * @event Shard#spawn
@@ -225,6 +228,10 @@ class Shard extends EventEmitter {
    *   .catch(console.error);
    */
   fetchClientValue(prop) {
+    // Shard is dead (maybe respawning), don't cache anything and error immediately
+    if (!this.process && !this.worker) return Promise.reject(new Error('SHARDING_NO_CHILD_EXISTS', this.id));
+
+    // Cached promise from previous call
     if (this._fetches.has(prop)) return this._fetches.get(prop);
 
     const promise = new Promise((resolve, reject) => {
@@ -255,6 +262,10 @@ class Shard extends EventEmitter {
    * @returns {Promise<*>} Result of the script execution
    */
   eval(script) {
+    // Shard is dead (maybe respawning), don't cache anything and error immediately
+    if (!this.process && !this.worker) return Promise.reject(new Error('SHARDING_NO_CHILD_EXISTS', this.id));
+
+    // Cached promise from previous call
     if (this._evals.has(script)) return this._evals.get(script);
 
     const promise = new Promise((resolve, reject) => {