diff --git a/py/genlast.py b/py/genlast.py
index 0071c7b8497c..ad44745d973a 100644
--- a/py/genlast.py
+++ b/py/genlast.py
@@ -48,6 +48,7 @@ def preprocess(command, output_dir, fn):
         process_file(fn, output_dir, output)
     except Exception as e:
         print(e, file=sys.stderr)
+        raise
 
 
 def maybe_preprocess(command, output_dir, fn):
@@ -72,6 +73,18 @@ def maybe_preprocess(command, output_dir, fn):
     # Mac and Windows use 'spawn'.  Uncomment this during testing to catch spawn-specific problems on Linux.
     # multiprocessing.set_start_method("spawn")
     executor = ProcessPoolExecutor(max_workers=multiprocessing.cpu_count() + 1)
-    executor.map(maybe_preprocess, itertools.repeat(command), itertools.repeat(output_dir), check)
-    executor.map(preprocess, itertools.repeat(command), itertools.repeat(output_dir), always)
+    results = []
+    try:
+        results.extend(
+            executor.map(
+                maybe_preprocess, itertools.repeat(command), itertools.repeat(output_dir), check
+            )
+        )
+        results.extend(
+            executor.map(
+                preprocess, itertools.repeat(command), itertools.repeat(output_dir), always
+            )
+        )
+    except subprocess.CalledProcessError:
+        raise SystemExit(1)
     executor.shutdown()
diff --git a/supervisor/shared/translate.c b/supervisor/shared/translate.c
index 674df7579a71..fefda4600646 100644
--- a/supervisor/shared/translate.c
+++ b/supervisor/shared/translate.c
@@ -87,11 +87,13 @@ STATIC int put_utf8(char *buf, int u) {
 }
 
 uint16_t decompress_length(const compressed_string_t *compressed) {
+    #ifndef NO_QSTR
     #if (compress_max_length_bits <= 8)
     return 1 + (compressed->data >> (8 - compress_max_length_bits));
     #else
     return 1 + ((compressed->data * 256 + compressed->tail[0]) >> (16 - compress_max_length_bits));
     #endif
+    #endif
 }
 
 char *decompress(const compressed_string_t *compressed, char *decompressed) {