diff --git a/aiochclient/_types.pyx b/aiochclient/_types.pyx
index a1123be..9c04e61 100644
--- a/aiochclient/_types.pyx
+++ b/aiochclient/_types.pyx
@@ -552,7 +552,10 @@ cdef class MapType:
         self.value_type = what_py_type(tps[comma_index + 1:], container=True)
 
     cdef dict _convert(self, str string):
-        key, value = string[1:-1].split(':', 1)
+        splits = string[1:-1].split(':', 1)
+        if len(splits) < 2:
+            return {}
+        key, value = splits
         return {
             self.key_type.p_type(decode(key.encode())): self.value_type.p_type(decode(value.encode()))
         }
diff --git a/aiochclient/types.py b/aiochclient/types.py
index efa3fab..2080afb 100644
--- a/aiochclient/types.py
+++ b/aiochclient/types.py
@@ -322,7 +322,10 @@ def __init__(self, name: str, **kwargs):
         self.value_type = what_py_type(tps[comma_index + 1 :], container=True)
 
     def p_type(self, string: str) -> dict:
-        key, value = string[1:-1].split(':', 1)
+        splits = string[1:-1].split(':', 1)
+        if len(splits) < 2:
+            return {}
+        key, value = splits
         return {
             self.key_type.p_type(self.decode(key.encode())): self.value_type.p_type(
                 self.decode(value.encode())