diff --git a/CHANGELOG.yaml b/CHANGELOG.yaml
index ba3bb807..77ec69e2 100644
--- a/CHANGELOG.yaml
+++ b/CHANGELOG.yaml
@@ -1,3 +1,6 @@
+unreleased:
+  fixed bugs:
+    - GH-1023 Prevented invalid events from being executed
 5.0.0:
   date: 2024-06-19
   breaking changes:
diff --git a/lib/postman-sandbox.js b/lib/postman-sandbox.js
index bb4ed609..4efd8d03 100644
--- a/lib/postman-sandbox.js
+++ b/lib/postman-sandbox.js
@@ -83,12 +83,17 @@ class PostmanSandbox extends UniversalVM {
         !_.isObject(options) && (options = {});
         !_.isFunction(callback) && (callback = _.noop);
 
-        // if the target is simple code, we make a generic event out of it
-        if (_.isString(target) || _.isArray(target)) {
-            target = new PostmanEvent({ script: target });
+        if (!PostmanEvent.isEvent(target)) {
+            if (_.isString(target) || _.isArray(target)) {
+                target = new PostmanEvent({ script: target });
+            }
+            else if (_.isObject(target)) {
+                target = new PostmanEvent(target);
+            }
         }
-        // if target is not a code and instead is not something that can be cast to an event, it is definitely an error
-        else if (!_.isObject(target)) {
+
+        // This will bail out when the target is not a valid event with proper `script.exec` value
+        if (typeof target?.script?.toSource?.() !== 'string') {
             return callback(new Error('sandbox: no target provided for execution'));
         }
 
diff --git a/lib/sandbox/execute.js b/lib/sandbox/execute.js
index d1debb63..b06aded7 100644
--- a/lib/sandbox/execute.js
+++ b/lib/sandbox/execute.js
@@ -118,6 +118,10 @@ module.exports = function (bridge, glob) {
 
             // extract the code from event
             code = _.isFunction(event.script && event.script.toSource) && ((code) => {
+                if (typeof code !== 'string') {
+                    return;
+                }
+
                 // wrap it in an async function to support top-level await
                 const asyncCode = `;(async()=>{;
                     ${code}
diff --git a/test/unit/sandbox-sanity.test.js b/test/unit/sandbox-sanity.test.js
index 52884eaf..6e775927 100644
--- a/test/unit/sandbox-sanity.test.js
+++ b/test/unit/sandbox-sanity.test.js
@@ -16,6 +16,59 @@ describe('sandbox', function () {
         });
     });
 
+    describe('invalid target', function () {
+        let context;
+
+        function tester (input, done) {
+            context.on('error', done);
+            context.execute(input, function (err) {
+                expect(err).to.be.ok;
+                expect(err).to.have.property('message', 'sandbox: no target provided for execution');
+
+                done();
+            });
+            context.off('error', done);
+        }
+
+
+        before(function (done) {
+            Sandbox.createContext(function (err, ctx) {
+                if (err) { return done(err); }
+                context = ctx;
+                done();
+            });
+        });
+
+        it('should not execute `null`', function (done) { tester(null, done); });
+        it('should not execute `undefined`', function (done) { tester(undefined, done); });
+        it('should not execute `{}`', function (done) { tester({}, done); });
+        it('should not execute `{ script: {} }`', function (done) { tester({ script: {} }, done); });
+    });
+
+    describe('valid target', function () {
+        let context;
+
+        function tester (input, done) {
+            context.on('error', done);
+            context.execute(input, done);
+            context.off('error', done);
+        }
+
+
+        before(function (done) {
+            Sandbox.createContext(function (err, ctx) {
+                if (err) { return done(err); }
+                context = ctx;
+                done();
+            });
+        });
+
+        it('should execute a \'\'', function (done) { tester('', done); });
+        it('should execute a []', function (done) { tester([], done); });
+        it('should execute a [\'\']', function (done) { tester([''], done); });
+        it('should execute a { script: { exec: \'\' } }', function (done) { tester({ script: { exec: '' } }, done); });
+    });
+
     it('should execute a piece of code', function (done) {
         Sandbox.createContext(function (err, ctx) {
             if (err) { return done(err); }