diff --git a/resources/project_manager/generate_html.py b/resources/project_manager/generate_html.py
index 12ee4839..d2881fbf 100755
--- a/resources/project_manager/generate_html.py
+++ b/resources/project_manager/generate_html.py
@@ -323,7 +323,7 @@ def generate_set_options(doc):
                     html += f"    if({option_let} === undefined){{{option_let} = false;}}\n"
                     html += f"    document.getElementById('{id_name}').checked = {option_let};\n"
                 elif(option_type == "input_comma"):
-                    html += f"    if({option_let} === undefined){{{option_let} = '';}}\n"
+                    html += f"    if({option_let} === undefined){{{option_let} = [];}}\n"
                     html += f"    document.getElementById('{id_name}').value = {option_let}.join(',');\n"
                 elif(option_type == "subtitle"):
                     pass