diff --git a/changelog.md b/changelog.md
index be49578f2..f6e7d1e17 100644
--- a/changelog.md
+++ b/changelog.md
@@ -39,6 +39,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Fix bug on models default folder opening, see [this issue](https://github.com/ditrit/leto-modelizer/issues/303).
 * Fix Sonar new bugs/code smell due to quality profil change, see [this issue](https://github.com/ditrit/leto-modelizer/issues/322).
 * Fix bug on using default file name from plugin instead of the file name specified by the user, when adding a component after creating a diagram from scratch.
+* Fix Array attributes to allow missing definition, see [this issue](https://github.com/ditrit/leto-modelizer/issues/344).
 
 ### Removed
 
diff --git a/src/components/inputs/ArrayInput.vue b/src/components/inputs/ArrayInput.vue
index 32e1c9190..49b0c367d 100644
--- a/src/components/inputs/ArrayInput.vue
+++ b/src/components/inputs/ArrayInput.vue
@@ -27,7 +27,7 @@ const props = defineProps({
 });
 
 const arrayInput = ref(null);
-const options = ref(props.attribute.definition.rules.values);
+const options = ref(props.attribute.definition?.rules.values || null);
 const localValue = ref(props.attribute.value);
 
 watch(() => arrayInput.value, () => {
diff --git a/tests/unit/components/inputs/ArrayInput.spec.js b/tests/unit/components/inputs/ArrayInput.spec.js
index 281260205..a4b81e277 100644
--- a/tests/unit/components/inputs/ArrayInput.spec.js
+++ b/tests/unit/components/inputs/ArrayInput.spec.js
@@ -8,45 +8,108 @@ import { ComponentAttributeDefinition } from 'leto-modelizer-plugin-core';
 installQuasarPlugin();
 
 describe('Test component: ArrayInput', () => {
-  let wrapper;
-
-  beforeEach(() => {
-    wrapper = shallowMount(ArrayInput, {
-      props: {
-        attribute: {
-          value: ['test'],
-          definition: new ComponentAttributeDefinition(),
-        },
-      },
-      global: {
-        stubs: {
-          qSelect: true,
-        },
-        plugins: [
-          createI18n({
-            locale: 'en-US',
-            allowComposition: true,
-            messages: i18nConfiguration,
-          }),
-        ],
-      },
-    });
-    wrapper.vm.arrayInput = {
-      validate: jest.fn(() => Promise.resolve(true)),
-    };
-  });
+  const global = {
+    stubs: {
+      qSelect: true,
+    },
+    plugins: [
+      createI18n({
+        locale: 'en-US',
+        allowComposition: true,
+        messages: i18nConfiguration,
+      }),
+    ],
+  };
 
   describe('Test variables initialization', () => {
     describe('Test prop: attribute', () => {
       it('should be an object containing value', () => {
+        const wrapper = shallowMount(ArrayInput, {
+          props: {
+            attribute: {
+              value: ['test'],
+              definition: new ComponentAttributeDefinition(),
+            },
+          },
+          global,
+        });
+        wrapper.vm.arrayInput = {
+          validate: jest.fn(() => Promise.resolve(true)),
+        };
         expect(wrapper.vm.attribute.value).toEqual(['test']);
       });
     });
 
     describe('Test variable: localValue', () => {
       it('should match attribute.value', () => {
+        const wrapper = shallowMount(ArrayInput, {
+          props: {
+            attribute: {
+              value: ['test'],
+              definition: new ComponentAttributeDefinition(),
+            },
+          },
+          global,
+        });
+        wrapper.vm.arrayInput = {
+          validate: jest.fn(() => Promise.resolve(true)),
+        };
         expect(wrapper.vm.localValue).toEqual(['test']);
       });
     });
+
+    describe('Test variable: options', () => {
+      it('should not be null when the attribute has a definition and rules with values', () => {
+        const wrapper = shallowMount(ArrayInput, {
+          props: {
+            attribute: {
+              value: ['test'],
+              definition: new ComponentAttributeDefinition({
+                rules: {
+                  values: ['value1', 'value2', 'value3'],
+                },
+              }),
+            },
+          },
+          global,
+        });
+        wrapper.vm.arrayInput = {
+          validate: jest.fn(() => Promise.resolve(true)),
+        };
+        expect(wrapper.vm.options).toEqual(['value1', 'value2', 'value3']);
+      });
+
+      it('should be null when the attribute has a definition with no rules', () => {
+        const wrapper = shallowMount(ArrayInput, {
+          props: {
+            attribute: {
+              value: ['test'],
+              definition: new ComponentAttributeDefinition(),
+            },
+          },
+          global,
+        });
+        wrapper.vm.arrayInput = {
+          validate: jest.fn(() => Promise.resolve(true)),
+        };
+        expect(wrapper.vm.options).toBeNull();
+      });
+
+      it('should be null and not raise an error when the attribute has no definition', () => {
+        const wrapper = shallowMount(ArrayInput, {
+          props: {
+            attribute: {
+              value: ['test'],
+              definition: null,
+            },
+          },
+          global,
+        });
+        wrapper.vm.arrayInput = {
+          validate: jest.fn(() => Promise.resolve(true)),
+        };
+        expect(wrapper.vm.options).toBeNull();
+      });
+    });
   });
 });