diff --git a/src/Filament/Integration/Builders/FormBuilder.php b/src/Filament/Integration/Builders/FormBuilder.php
index 4382575d..4e1c4a7e 100644
--- a/src/Filament/Integration/Builders/FormBuilder.php
+++ b/src/Filament/Integration/Builders/FormBuilder.php
@@ -13,6 +13,7 @@
 use Relaticle\CustomFields\Filament\Integration\Factories\SectionComponentFactory;
 use Relaticle\CustomFields\Models\CustomField;
 use Relaticle\CustomFields\Models\CustomFieldSection;
+use Relaticle\CustomFields\Services\Visibility\CoreVisibilityLogicService;
 
 class FormBuilder extends BaseBuilder
 {
@@ -42,16 +43,14 @@ public function withoutSections(bool $withoutSections = true): static
 
     private function getDependentFieldCodes(Collection $fields): array
     {
+        $service = app(CoreVisibilityLogicService::class);
         $dependentCodes = [];
 
         foreach ($fields as $field) {
-            if ($field->visibility_conditions && is_array($field->visibility_conditions)) {
-                foreach ($field->visibility_conditions as $condition) {
-                    if (isset($condition['field'])) {
-                        $dependentCodes[] = $condition['field'];
-                    }
-                }
-            }
+            $dependentCodes = array_merge(
+                $dependentCodes,
+                $service->getDependentFields($field),
+            );
 
             $validationRules = $field->validation_rules;
             if ($validationRules) {
diff --git a/tests/Feature/Integration/FormBuilderStrictModeTest.php b/tests/Feature/Integration/FormBuilderStrictModeTest.php
new file mode 100644
index 00000000..28739076
--- /dev/null
+++ b/tests/Feature/Integration/FormBuilderStrictModeTest.php
@@ -0,0 +1,128 @@
+<?php
+
+declare(strict_types=1);
+
+// Tests that FormBuilder::getDependentFieldCodes() does not access the
+// non-existent `visibility_conditions` attribute on CustomField, which throws
+// MissingAttributeException when Model::preventAccessingMissingAttributes() is
+// enabled (Laravel strict mode).  Regression test for issue #149.
+
+use Illuminate\Database\Eloquent\Model;
+use Relaticle\CustomFields\Enums\ConditionSource;
+use Relaticle\CustomFields\Enums\CustomFieldsFeature;
+use Relaticle\CustomFields\Enums\VisibilityLogic;
+use Relaticle\CustomFields\Enums\VisibilityMode;
+use Relaticle\CustomFields\Enums\VisibilityOperator;
+use Relaticle\CustomFields\FeatureSystem\FeatureConfigurator;
+use Relaticle\CustomFields\Filament\Integration\Builders\FormBuilder;
+use Relaticle\CustomFields\Models\CustomField;
+use Relaticle\CustomFields\Models\CustomFieldSection;
+use Relaticle\CustomFields\Tests\Fixtures\Models\Post;
+use Relaticle\CustomFields\Tests\Fixtures\Models\User;
+use Relaticle\CustomFields\Tests\Fixtures\Resources\Posts\Pages\CreatePost;
+
+beforeEach(function (): void {
+    $this->user = User::factory()->create();
+    $this->actingAs($this->user);
+
+    config()->set('custom-fields.features', FeatureConfigurator::configure()
+        ->enable(
+            CustomFieldsFeature::FIELD_CONDITIONAL_VISIBILITY,
+            CustomFieldsFeature::UI_TABLE_COLUMNS,
+            CustomFieldsFeature::UI_TOGGLEABLE_COLUMNS,
+            CustomFieldsFeature::UI_TABLE_FILTERS,
+            CustomFieldsFeature::SYSTEM_MANAGEMENT_INTERFACE,
+            CustomFieldsFeature::SYSTEM_SECTIONS,
+        )
+    );
+
+    $this->section = CustomFieldSection::factory()
+        ->forEntityType(Post::class)
+        ->create();
+});
+
+afterEach(function (): void {
+    // Disable strict mode after each test so other tests are not affected.
+    Model::preventAccessingMissingAttributes(false);
+});
+
+describe('FormBuilder strict-mode regression (issue #149)', function (): void {
+    it('does not throw MissingAttributeException when Model::preventAccessingMissingAttributes() is enabled and a field has visibility conditions', function (): void {
+        // Arrange — two custom fields; the second is conditionally visible based on the first.
+        $controlField = CustomField::factory()->create([
+            'custom_field_section_id' => $this->section->id,
+            'name' => 'Control field',
+            'code' => 'control_field',
+            'type' => 'select',
+            'entity_type' => Post::class,
+        ]);
+
+        $dependentField = CustomField::factory()->create([
+            'custom_field_section_id' => $this->section->id,
+            'name' => 'Dependent field',
+            'code' => 'dependent_field',
+            'type' => 'text',
+            'entity_type' => Post::class,
+            'settings' => [
+                'visibility' => [
+                    'mode' => VisibilityMode::SHOW_WHEN,
+                    'logic' => VisibilityLogic::ALL,
+                    'conditions' => [[
+                        'field_code' => 'control_field',
+                        'operator' => VisibilityOperator::IS_NOT_EMPTY,
+                        'value' => null,
+                        'source' => ConditionSource::CustomField,
+                    ]],
+                ],
+            ],
+        ]);
+
+        // Enable Laravel strict mode — this is the exact flag that triggers
+        // MissingAttributeException on unknown attribute access.
+        Model::preventAccessingMissingAttributes();
+
+        // Act — building the form must not throw.
+        $builder = app(FormBuilder::class)->forModel(new Post);
+
+        expect(fn () => $builder->values())->not->toThrow(\Illuminate\Database\Eloquent\MissingAttributeException::class);
+    });
+
+    it('correctly resolves dependent field codes via CoreVisibilityLogicService in strict mode', function (): void {
+        // Arrange
+        $controlField = CustomField::factory()->create([
+            'custom_field_section_id' => $this->section->id,
+            'name' => 'Status',
+            'code' => 'status',
+            'type' => 'select',
+            'entity_type' => Post::class,
+        ]);
+
+        $dependentField = CustomField::factory()->create([
+            'custom_field_section_id' => $this->section->id,
+            'name' => 'Priority',
+            'code' => 'priority',
+            'type' => 'text',
+            'entity_type' => Post::class,
+            'settings' => [
+                'visibility' => [
+                    'mode' => VisibilityMode::SHOW_WHEN,
+                    'logic' => VisibilityLogic::ALL,
+                    'conditions' => [[
+                        'field_code' => 'status',
+                        'operator' => VisibilityOperator::IS_NOT_EMPTY,
+                        'value' => null,
+                        'source' => ConditionSource::CustomField,
+                    ]],
+                ],
+            ],
+        ]);
+
+        Model::preventAccessingMissingAttributes();
+
+        // Act — render via Livewire to exercise the full FormContainer → FormBuilder path.
+        $test = livewire(CreatePost::class);
+
+        // Assert — the form renders without exception.
+        $test->assertSuccessful();
+    });
+});