diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80a693f9..690b86cc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ## [Unreleased]
 ### Changed
 - Update scripting-addition to support macOS Big Sur 11.0 Build 20A5384c [#589](https://github.com/koekeishiya/yabai/issues/589)
+- Return a non-zero exit code when focusing a space fails due to an issue with the scripting-addition [#181](https://github.com/koekeishiya/yabai/issues/181)
 
 ## [3.3.0] - 2020-09-03
 ### Added
diff --git a/src/message.c b/src/message.c
index f8f03e9f..f0be3068 100644
--- a/src/message.c
+++ b/src/message.c
@@ -1326,6 +1326,8 @@ static void handle_domain_space(FILE *rsp, struct token domain, char *message)
                 daemon_fail(rsp, "cannot focus space because the display is in the middle of an animation.\n");
             } else if (result == SPACE_OP_ERROR_IN_MISSION_CONTROL) {
                 daemon_fail(rsp, "cannot focus space because mission-control is active.\n");
+            } else {
+                daemon_fail(rsp, "cannot focus space due to an error with the scripting-addition.\n");
             }
         }
     } else if (token_equals(command, COMMAND_SPACE_MOVE)) {
diff --git a/src/space_manager.c b/src/space_manager.c
index e4c42075..2f252dce 100644
--- a/src/space_manager.c
+++ b/src/space_manager.c
@@ -641,6 +641,8 @@ enum space_op_error space_manager_focus_space(uint64_t sid)
 
     if (scripting_addition_focus_space(sid)) {
         if (focus_display) display_manager_focus_display(new_did);
+    } else {
+        return SPACE_OP_ERROR_SCRIPTING_ADDITION;
     }
 
     return SPACE_OP_ERROR_SUCCESS;
diff --git a/src/space_manager.h b/src/space_manager.h
index 6bbcbafd..77e58d64 100644
--- a/src/space_manager.h
+++ b/src/space_manager.h
@@ -44,6 +44,7 @@ enum space_op_error
     SPACE_OP_ERROR_SAME_DISPLAY         = 7,
     SPACE_OP_ERROR_DISPLAY_IS_ANIMATING = 8,
     SPACE_OP_ERROR_IN_MISSION_CONTROL   = 9,
+    SPACE_OP_ERROR_SCRIPTING_ADDITION   = 10,
 };
 
 bool space_manager_has_separate_spaces(void);