diff --git a/packages/protocol/contracts-0.8/common/EpochManager.sol b/packages/protocol/contracts-0.8/common/EpochManager.sol
index 649b5b76cf..039ade70b8 100644
--- a/packages/protocol/contracts-0.8/common/EpochManager.sol
+++ b/packages/protocol/contracts-0.8/common/EpochManager.sol
@@ -192,7 +192,7 @@ contract EpochManager is
   function startNextEpochProcess() external nonReentrant onlySystemAlreadyInitialized {
     require(isTimeForNextEpoch(), "Epoch is not ready to start");
     require(
-      epochProcessing.status != EpochProcessStatus.Started,
+      epochProcessing.status == EpochProcessStatus.NotStarted,
       "Epoch process is already started"
     );
     require(!isEpochProcessingStarted(), "Epoch process is already started");
@@ -600,10 +600,16 @@ contract EpochManager is
     emit OracleAddressSet(newOracleAddress);
   }
 
+  /**
+   * @return Whether epoch is being processed by individualy group by group.
+   */
   function isIndividualProcessing() public view returns (bool) {
     return epochProcessing.status == EpochProcessStatus.IndivudualGroupsProcessing;
   }
 
+  /**
+   * @return Whether epoch process has been started.
+   */
   function isEpochProcessingStarted() public view returns (bool) {
     return isOnEpochProcess() || isIndividualProcessing();
   }
diff --git a/packages/protocol/test-sol/unit/common/EpochManager.t.sol b/packages/protocol/test-sol/unit/common/EpochManager.t.sol
index 5b284113e5..4beda482bc 100644
--- a/packages/protocol/test-sol/unit/common/EpochManager.t.sol
+++ b/packages/protocol/test-sol/unit/common/EpochManager.t.sol
@@ -711,6 +711,11 @@ contract EpochManagerTest_setToProcessGroups is EpochManagerTest {
     epochManager.startNextEpochProcess();
   }
 
+  function test_Reverts_WhenSetToProcessGroups() public {
+    vm.expectRevert("Epoch process is not started");
+    epochManager.setToProcessGroups();
+  }
+
   function test_setsGroupRewards() public {
     (address[] memory groups, , ) = getGroupsWithLessersAndGreaters();
     epochManager.startNextEpochProcess();