diff --git a/i2c-vr/xdpe1x2xx/xdpe1x2xx.cpp b/i2c-vr/xdpe1x2xx/xdpe1x2xx.cpp
index a2d919b..184c17b 100644
--- a/i2c-vr/xdpe1x2xx/xdpe1x2xx.cpp
+++ b/i2c-vr/xdpe1x2xx/xdpe1x2xx.cpp
@@ -481,7 +481,15 @@
     {
         if (image[i] == '\n')
         {
-            std::memcpy(line, image + start, i - start);
+            const size_t lineLength = i - start;
+            if (lineLength >= maxLineLength)
+            {
+                error("line length exceeded 40, please check image file.");
+                return false;
+            }
+            std::memcpy(line, image + start, lineLength);
+            line[lineLength] = '\0';
+
             if (!strncmp(line, DataComment, lenComment))
             {
                 token = line + lenComment;
@@ -705,7 +713,7 @@
     {
         configuration.section[i].type = 0;
         configuration.section[i].dataCnt = 0;
-        for (int j = 0; j <= MaxSectDataCnt; j++)
+        for (int j = 0; j < MaxSectDataCnt; j++)
         {
             configuration.section[i].data[j] = 0;
         }