diff --git a/app/Services/ObjectService.php b/app/Services/ObjectService.php
index 37b034c1..5c694a2b 100644
--- a/app/Services/ObjectService.php
+++ b/app/Services/ObjectService.php
@@ -376,19 +376,27 @@ public static function objectRequirementsWithLevelsMet(string $machine_name, int
      */
     public static function objectRequirementsMetWithQueue(string $machine_name, int $target_level, PlanetService $planet, PlayerService $player): bool
     {
-        // Check the object's requirements against the existing objects
         $object = self::getObjectByMachineName($machine_name);
-        $incompleteRequirements = self::filterCompletedRequirements($object->requirements, $planet, $player);
 
+        // Check object's previous levels against queued objects
         if (!self::hasPreviousLevelsInQueue($target_level, $object, $planet, $player)) {
             return false;
         }
 
-        if (count($incompleteRequirements) === 0) {
+        // Disallow researching when Research Lab is upgrading
+        if ($object->type === GameObjectType::Research && $player->isBuildingObject('research_lab')) {
+            return false;
+        }
+
+        // Check object's requirements against built objects
+        $missingRequirements = self::filterCompletedRequirements($object->requirements, $planet, $player);
+
+        if (count($missingRequirements) === 0) {
             return true;
         }
 
-        return count(self::filterQueuedRequirements($incompleteRequirements, $planet, $player)) === 0;
+        // Check object's requirements against queued objects
+        return count(self::filterQueuedRequirements($missingRequirements, $planet, $player)) === 0;
     }
 
     /**
diff --git a/tests/AccountTestCase.php b/tests/AccountTestCase.php
index 1ed6571f..bfd3b41c 100644
--- a/tests/AccountTestCase.php
+++ b/tests/AccountTestCase.php
@@ -502,6 +502,27 @@ protected function assertRequirementsNotMet(TestResponse $response, string $mach
         }
     }
 
+    protected function assertObjectNotInResearchQueue(TestResponse $response, string $machine_name, string $error_message = ''): void
+    {
+        // Get object name from machine name.
+        try {
+            $object = ObjectService::getObjectByMachineName($machine_name);
+        } catch (Exception $e) {
+            $this->fail('Failed to get object by machine name: ' . $machine_name . '. Error: ' . $e->getMessage());
+        }
+
+        // Check if cancel text is present on page.
+        try {
+            $response->assertDontSee('cancel ' . $object->title);
+        } catch (Exception $e) {
+            if (!empty($error_message)) {
+                $this->fail($error_message . '. Error: ' . $e->getMessage());
+            } else {
+                $this->fail('Object ' . $object->title . ' is in the research queue. Error: ' . $e->getMessage());
+            }
+        }
+    }
+
     /**
      * Add a resource build request to the current users current planet.
      * @param string $machine_name
diff --git a/tests/Feature/ResearchQueueTest.php b/tests/Feature/ResearchQueueTest.php
index d19cc08e..1d17d261 100644
--- a/tests/Feature/ResearchQueueTest.php
+++ b/tests/Feature/ResearchQueueTest.php
@@ -213,4 +213,30 @@ public function testResearchLabRequirement(): void
         $response->assertStatus(200);
         $this->assertObjectLevelOnPage($response, 'energy_technology', 1, 'Energy technology is not at level one 2 minutes after build request issued.');
     }
+
+    /**
+     * Verify that ongoing upgrade of research lab prevents researching.
+     * @throws Exception
+     */
+    public function testResearchLabUpgradingPreventsResearching(): void
+    {
+        // Add required resources for research to planet
+        $this->planetAddResources(new Resources(5000, 5000, 5000, 0));
+        $this->planetSetObjectLevel('research_lab', 1);
+
+        // Add Research Lab level 2 to build queue
+        $this->addFacilitiesBuildRequest('research_lab');
+        $response = $this->get('/facilities');
+        $response->assertStatus(200);
+        $this->assertObjectInQueue($response, 'research_lab', 2, 'Research Lab level 2 is not in build queue');
+
+        $this->assertThrows(
+            fn () => $this->addResearchBuildRequest('energy_technology'),
+        );
+
+        // Verify that Energy Technology is not in research queue
+        $response = $this->get('/research');
+        $response->assertStatus(200);
+        $this->assertObjectNotInResearchQueue($response, 'energy_technology', 'Energy Technology is in research queue but should not be added.');
+    }
 }