diff --git a/algorithms/bfs.py b/algorithms/bfs.py
index 94b150f..2e76d45 100644
--- a/algorithms/bfs.py
+++ b/algorithms/bfs.py
@@ -121,7 +121,7 @@ def go(row, column, direction):
 
 
 def is_valid_move(map, target_row, target_column):
-    if 0 <= target_row < ROWS and 0 <= target_column < COLUMNS:
+    if 0 <= target_row < ROWS and 0 <= target_column < COLUMNS and map[target_row][target_column] == ' ':
         return True
 
     return False