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-rw-r--r--src/core/workspace.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/core/workspace.c b/src/core/workspace.c
index b638177a8..6d2b471e3 100644
--- a/src/core/workspace.c
+++ b/src/core/workspace.c
@@ -729,6 +729,7 @@ meta_workspace_index (MetaWorkspace *workspace)
{
int ret;
+ g_return_val_if_fail (META_IS_WORKSPACE (workspace), -1);
ret = g_list_index (workspace->manager->workspaces, workspace);
g_return_val_if_fail (ret >= 0, -1);