diff --git a/autodoc/common.py b/autodoc/common.py
index f65e3c1..0d6e4e1 100644
--- a/autodoc/common.py
+++ b/autodoc/common.py
@@ -37,9 +37,11 @@ def signal_byte_size(parent_id, sig_id, sig):
     noe = noe if noe > 0 else 1
     nos = 1 if "Samples" not in sig else int(sig["Samples"])
     if "Type" not in sig:
-        logging.fatal(f"no type defined for signal {parent_id}.{sig_id}")
-        sys.exit(1)
-    bytes = type_bytes_count(sig["Type"])
+        logging.warning(f"no type defined for signal {parent_id}.{sig_id}")
+    if "Type" in sig:
+        bytes = type_bytes_count(sig["Type"])
+    else:
+        bytes = type_bytes_count(signal_type(sig)[0])
     tot = noe * nod * nos
 
     if "Ranges" in sig:
@@ -51,7 +53,10 @@ def signal_byte_size(parent_id, sig_id, sig):
 
 
 def signal_type(sig):
-    type_name = sig["Type"]
+    if "Type" in sig:
+        type_name = sig["Type"]
+    else:
+        type_name = "uint32"
     noe = int(sig["NumberOfElements"]) if "NumberOfElements" in sig else 1
     nod = int(sig["NumberOfDimensions"]) if "NumberOfDimensions" in sig else 1
     nod = nod if nod > 0 else 1