diff --git a/package.json b/package.json
index 93247bb..b8cce50 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rulepilot",
-  "version": "1.1.11",
+  "version": "1.1.12",
   "description": "Rule parsing engine for JSON rules",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/src/services/validator.ts b/src/services/validator.ts
index 6f99de2..b25e9c6 100644
--- a/src/services/validator.ts
+++ b/src/services/validator.ts
@@ -20,6 +20,17 @@ export class Validator {
     // Assume the rule is valid.
     let result: ValidationResult = { isValid: true };
 
+    // Check the rule is a valid JSON
+    if (!this.objectDiscovery.isObject(rule)) {
+      return {
+        isValid: false,
+        error: {
+          message: "The rule must be a valid JSON object.",
+          element: rule,
+        },
+      };
+    }
+
     // Cater for the case where the conditions property is not an array.
     const conditions =
       rule.conditions instanceof Array ? rule.conditions : [rule.conditions];
@@ -68,6 +79,17 @@ export class Validator {
     // Set the type of condition.
     const type = this.objectDiscovery.conditionType(condition);
 
+    // Check if the condition is iterable
+    if(!Array.isArray(condition[type])) {
+      return {
+        isValid: false,
+        error: {
+          message: `The condition '${type}' should be iterable.`,
+          element: condition,
+        },
+      };
+    }
+
     // Validate each item in the condition.
     for (const node of condition[type]) {
       const isCondition = this.objectDiscovery.isCondition(node);