diff --git a/IPython/core/magics/execution.py b/IPython/core/magics/execution.py
index effedbd..c6cf082 100644
--- a/IPython/core/magics/execution.py
+++ b/IPython/core/magics/execution.py
@@ -451,7 +451,13 @@ class ExecutionMagics(Magics):
 
         if not (args.breakpoint or args.statement or cell):
             self._debug_post_mortem()
+        elif not (args.breakpoint or cell):
+            # If there is no breakpoints, the line is just code to execute
+            self._debug_exec(line, None)
         else:
+            # Here we try to reconstruct the code from the output of
+            # parse_argstring. This might not work if the code has spaces
+            # For example this fails for `print("a b")`
             code = "\n".join(args.statement)
             if cell:
                 code += "\n" + cell