diff --git a/lib/core/dump.py b/lib/core/dump.py
index d89db6623..dd486a754 100644
--- a/lib/core/dump.py
+++ b/lib/core/dump.py
@@ -148,7 +148,7 @@ class Dump:
                     if isinstance(table, (list, tuple, set)):
                         table = table[0]
 
-                    maxlength = max(maxlength, len(table))
+                    maxlength = max(maxlength, len(str(table)))
 
             lines = "-" * (int(maxlength) + 2)
 
@@ -168,7 +168,7 @@ class Dump:
                     if isinstance(table, (list, tuple, set)):
                         table = table[0]
 
-                    blank = " " * (maxlength - len(table))
+                    blank = " " * (maxlength - len(str(table)))
                     self.__write("| %s%s |" % (table, blank))
 
                 self.__write("+%s+\n" % lines)