diff --git a/bin/plug_ins/Auto_reboot/cp_master b/bin/plug_ins/Auto_reboot/cp_master
index e28d773..b7aad55 100755
--- a/bin/plug_ins/Auto_reboot/cp_master
+++ b/bin/plug_ins/Auto_reboot/cp_master
@@ -81,7 +81,7 @@
 
     get_plug_vars()
 
-    valid_value(AUTOBOOT_OPENBMC_HOST, ["", None])
+    valid_value(AUTOBOOT_OPENBMC_HOST)
     global AUTO_REBOOT_DISABLE
     if pgm_name == "cp_cleanup":
         AUTO_REBOOT_DISABLE = 0
diff --git a/bin/plug_ins/Stop/cp_stop_check b/bin/plug_ins/Stop/cp_stop_check
index acaddfe..713bd96 100755
--- a/bin/plug_ins/Stop/cp_stop_check
+++ b/bin/plug_ins/Stop/cp_stop_check
@@ -21,6 +21,9 @@
 # Restore sys.path[0].
 sys.path.insert(0, save_path_0)
 
+# Set exit_on_error for gen_valid functions.
+set_exit_on_error(True)
+
 # Initialize.
 STOP_REST_FAIL = ''
 STOP_COMMAND = ''
@@ -95,8 +98,7 @@
 
     get_plug_vars()
 
-    if not valid_value(AUTOBOOT_OPENBMC_HOST, ["", None]):
-        return False
+    valid_value(AUTOBOOT_OPENBMC_HOST)
 
     gen_post_validation(exit_function, signal_handler)
 
diff --git a/lib/gen_call_robot.py b/lib/gen_call_robot.py
index d504d2e..9f67593 100755
--- a/lib/gen_call_robot.py
+++ b/lib/gen_call_robot.py
@@ -140,11 +140,9 @@
                 # Use to the apollo dir path.
                 ROBOT_TEST_BASE_DIR_PATH = apollo_dir_path + suffix
 
-    if not gv.valid_value(ROBOT_TEST_BASE_DIR_PATH):
-        return False
+    gv.valid_value(ROBOT_TEST_BASE_DIR_PATH)
     gp.dprint_vars(ROBOT_TEST_RUNNING_FROM_SB, ROBOT_TEST_BASE_DIR_PATH)
-    if not gv.valid_dir_path(ROBOT_TEST_BASE_DIR_PATH):
-        return False
+    gv.valid_dir_path(ROBOT_TEST_BASE_DIR_PATH)
 
     ROBOT_TEST_BASE_DIR_PATH = gm.add_trailing_slash(ROBOT_TEST_BASE_DIR_PATH)
     gm.set_mod_global(ROBOT_TEST_BASE_DIR_PATH)
@@ -177,8 +175,7 @@
                                     file.
     """
 
-    if not gv.valid_value(robot_file_path):
-        raise ValueError('Programmer error.')
+    gv.valid_value(robot_file_path)
 
     try:
         if ROBOT_TEST_BASE_DIR_PATH is NONE:
@@ -213,8 +210,7 @@
                 break
 
     gp.dprint_var(robot_file_path)
-    if not gv.valid_file_path(robot_file_path):
-        raise ValueError('Programmer error.')
+    gv.valid_file_path(robot_file_path)
 
     return robot_file_path
 
@@ -398,8 +394,7 @@
                                     apolloxxx import files, programs, etc.
     """
 
-    if not gv.valid_value(robot_cmd_buf):
-        return False
+    gv.valid_value(robot_cmd_buf)
 
     # Set global variables to aid in cleanup with process_robot_output_files.
     global gcr_last_robot_cmd_buf