diff --git a/unit_tests/regression.suite/inliner-keyerror-bug.lsl b/unit_tests/regression.suite/inliner-keyerror-bug.lsl
new file mode 100644
index 0000000..34e7ba2
--- /dev/null
+++ b/unit_tests/regression.suite/inliner-keyerror-bug.lsl
@@ -0,0 +1,13 @@
+integer x() inline
+{
+    return 3;
+}
+
+default
+{
+    touch(integer n)
+    {
+        x();
+        n++;
+    }
+}
diff --git a/unit_tests/regression.suite/inliner-keyerror-bug.out b/unit_tests/regression.suite/inliner-keyerror-bug.out
new file mode 100644
index 0000000..8e66321
--- /dev/null
+++ b/unit_tests/regression.suite/inliner-keyerror-bug.out
@@ -0,0 +1,16 @@
+default
+{
+    touch(integer LslLibrary)
+    {
+        integer loc____ret__00001;
+        {
+            {
+                loc____ret__00001 = 3;
+                ;
+            }
+        }
+        @___rtl__00001;
+        loc____ret__00001;
+        LslLibrary++;
+    }
+}
diff --git a/unit_tests/regression.suite/inliner-keyerror-bug.run b/unit_tests/regression.suite/inliner-keyerror-bug.run
new file mode 100644
index 0000000..9cd510d
--- /dev/null
+++ b/unit_tests/regression.suite/inliner-keyerror-bug.run
@@ -0,0 +1 @@
+main.py - -O -constfold,inline,shrinknames -y