diff --git a/src/base/Notifier.sol b/src/base/Notifier.sol
index 5e56c384d..318e5dadf 100644
--- a/src/base/Notifier.sol
+++ b/src/base/Notifier.sol
@@ -68,6 +68,7 @@ abstract contract Notifier is INotifier {
     {
         _positionConfigs(tokenId).setUnsubscribe();
         ISubscriber _subscriber = subscriber[tokenId];
+        if (_subscriber == NO_SUBSCRIBER) revert NotSubscribed();
 
         delete subscriber[tokenId];
 
diff --git a/src/interfaces/INotifier.sol b/src/interfaces/INotifier.sol
index 64f734309..49ecddea9 100644
--- a/src/interfaces/INotifier.sol
+++ b/src/interfaces/INotifier.sol
@@ -6,6 +6,8 @@ import {ISubscriber} from "./ISubscriber.sol";
 
 /// @notice This interface is used to opt in to sending updates to external contracts about position modifications or transfers
 interface INotifier {
+    /// @notice Thrown when unsubscribing without a subscriber
+    error NotSubscribed();
     /// @notice Wraps the revert message of the subscriber contract on a reverting subscription
     error Wrap__SubsciptionReverted(address subscriber, bytes reason);
     /// @notice Wraps the revert message of the subscriber contract on a reverting modify liquidity notification
diff --git a/test/position-managers/PositionManager.notifier.t.sol b/test/position-managers/PositionManager.notifier.t.sol
index 9a5dca4d4..82be5f3d9 100644
--- a/test/position-managers/PositionManager.notifier.t.sol
+++ b/test/position-managers/PositionManager.notifier.t.sol
@@ -340,7 +340,7 @@ contract PositionManagerNotifierTest is Test, PosmTestSetup, GasSnapshot {
         lpm.approve(address(this), tokenId);
         vm.stopPrank();
 
-        vm.expectRevert();
+        vm.expectRevert(INotifier.NotSubscribed.selector);
         lpm.unsubscribe(tokenId, config, ZERO_BYTES);
     }