diff --git a/NEWS.md b/NEWS.md
index 02c51855..3b624147 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -18,6 +18,7 @@ Red Panda C++ Version 2.10
   - change: Project's encoding shouldn't be set to "auto detect"
   - fix: Can't correctly set project file's encoding back to 'UTF-8'/'ANSI' in the project options dialog/files setting page.
   - enhancement: Simplified chinese translations for encoding names.
+  - fix: Crash when there are preprocessing directives like '#if 0/0' or '#if 0%0'
 
 Red Panda C++ Version 2.9
 
diff --git a/RedPandaIDE/debugger.cpp b/RedPandaIDE/debugger.cpp
index e98436e0..d84c96fc 100644
--- a/RedPandaIDE/debugger.cpp
+++ b/RedPandaIDE/debugger.cpp
@@ -634,10 +634,10 @@ void Debugger::sendBreakpointCommand(PBreakpoint breakpoint)
                         .arg(condition, filename)
                         .arg(breakpoint->line));
         } else {
-            //        sendCommand("-break-insert",
-            //                    QString("%1 --source \"%2\" --line %3")
-            //                    .arg(condition,filename)
-            //                    .arg(breakpoint->line));
+            sendCommand("-break-insert",
+                        QString("%1 --source \"%2\" --line %3")
+                        .arg(condition,filename)
+                        .arg(breakpoint->line));
         }
     }
 }
diff --git a/RedPandaIDE/parser/cpppreprocessor.cpp b/RedPandaIDE/parser/cpppreprocessor.cpp
index 9aba6b25..9cf5e7e2 100644
--- a/RedPandaIDE/parser/cpppreprocessor.cpp
+++ b/RedPandaIDE/parser/cpppreprocessor.cpp
@@ -1441,12 +1441,18 @@ bool CppPreprocessor::evalMulExpr(const QString &expr, int &result, int &pos)
             pos++;
             if (!evalUnaryExpr(expr,rightResult,pos))
                 return false;
-            result /= rightResult;
+            if (rightResult != 0)
+                result /= rightResult;
+            else
+                result = 0;
         } else if (expr[pos]=='%') {
             pos++;
             if (!evalUnaryExpr(expr,rightResult,pos))
                 return false;
-            result %= rightResult;
+            if (rightResult != 0)
+                result %= rightResult;
+            else
+                result = 0;
         } else {
             break;
         }