diff --git a/paramecio/cromosoma/extrafields/arrayfield.py b/paramecio/cromosoma/extrafields/arrayfield.py
index 361d350..80cfe00 100644
--- a/paramecio/cromosoma/extrafields/arrayfield.py
+++ b/paramecio/cromosoma/extrafields/arrayfield.py
@@ -39,7 +39,7 @@ class ArrayField(PhangoField):
 
     def get_type_sql(self):
 
-        return 'TEXT NOT NULL'
+        return 'TEXT NOT NULL DEFAULT ""'
     
     def show_formatted(self, value):
         
diff --git a/paramecio/cromosoma/extrafields/dictfield.py b/paramecio/cromosoma/extrafields/dictfield.py
index fac186d..50acb78 100644
--- a/paramecio/cromosoma/extrafields/dictfield.py
+++ b/paramecio/cromosoma/extrafields/dictfield.py
@@ -38,7 +38,7 @@ class DictField(PhangoField):
 
     def get_type_sql(self):
 
-        return 'TEXT NOT NULL'
+        return 'TEXT NOT NULL DEFAULT ""'
     
     def show_formatted(self, value):