diff --git a/apps/application/flow/compare/ge_compare.py b/apps/application/flow/compare/ge_compare.py
index bd85d0c3c52..e1cf2e7aac0 100644
--- a/apps/application/flow/compare/ge_compare.py
+++ b/apps/application/flow/compare/ge_compare.py
@@ -12,6 +12,9 @@
 class GECompare(Compare):
 
     def compare(self, source_value, compare, target_value):
+        if source_value is None:
+            return target_value is None
+
         try:
             return float(source_value) >= float(target_value)
         except Exception:
diff --git a/apps/application/flow/compare/gt_compare.py b/apps/application/flow/compare/gt_compare.py
index c83a1e765e0..fab86c4bc8c 100644
--- a/apps/application/flow/compare/gt_compare.py
+++ b/apps/application/flow/compare/gt_compare.py
@@ -12,6 +12,9 @@
 class GTCompare(Compare):
 
     def compare(self, source_value, compare, target_value):
+        if source_value is None:
+            return False
+
         try:
             return float(source_value) > float(target_value)
         except Exception:
diff --git a/apps/application/flow/compare/le_compare.py b/apps/application/flow/compare/le_compare.py
index 8b115d84b33..0ebdb394857 100644
--- a/apps/application/flow/compare/le_compare.py
+++ b/apps/application/flow/compare/le_compare.py
@@ -12,6 +12,9 @@
 class LECompare(Compare):
 
     def compare(self, source_value, compare, target_value):
+        if source_value is None:
+            return target_value is None
+
         try:
             return float(source_value) <= float(target_value)
         except Exception:
diff --git a/apps/application/flow/compare/lt_compare.py b/apps/application/flow/compare/lt_compare.py
index 6720af7f17a..ecf8d549bfd 100644
--- a/apps/application/flow/compare/lt_compare.py
+++ b/apps/application/flow/compare/lt_compare.py
@@ -12,6 +12,9 @@
 class LTCompare(Compare):
 
     def compare(self, source_value, compare, target_value):
+        if source_value is None:
+            return False
+
         try:
             return float(source_value) < float(target_value)
         except Exception: