diff --git a/mapytex/calculus/core/renders/tree2tex.py b/mapytex/calculus/core/renders/tree2tex.py
index 9699776..8dbdbd8 100644
--- a/mapytex/calculus/core/renders/tree2tex.py
+++ b/mapytex/calculus/core/renders/tree2tex.py
@@ -115,7 +115,10 @@ def mul2tex(left, right):
         if OPERATORS[right.node]["precedence"] < OPERATORS['*']["precedence"]:
             right_need_parenthesis = True
     except AttributeError:
-        right_ = right.__tex__
+        try:
+            right_ = right.__tex__
+        except AttributeError:
+            right_ = right
     else:
         if right_need_parenthesis:
             display_time = False
diff --git a/mapytex/calculus/core/renders/tree2txt.py b/mapytex/calculus/core/renders/tree2txt.py
index 6350241..3b9da70 100644
--- a/mapytex/calculus/core/renders/tree2txt.py
+++ b/mapytex/calculus/core/renders/tree2txt.py
@@ -115,7 +115,10 @@ def mul2txt(left, right):
         if OPERATORS[right.node]["precedence"] < OPERATORS['*']["precedence"]:
             right_need_parenthesis = True
     except AttributeError:
-        right_ = right.__txt__
+        try:
+            right_ = right.__txt__
+        except AttributeError:
+            right_ = right
     else:
         if right_need_parenthesis:
             display_time = False