diff --git a/app/src/main/java/org/ntlab/irisclient/GameMasterActivity.java b/app/src/main/java/org/ntlab/irisclient/GameMasterActivity.java
index 010d4ed..bd5bdb3 100644
--- a/app/src/main/java/org/ntlab/irisclient/GameMasterActivity.java
+++ b/app/src/main/java/org/ntlab/irisclient/GameMasterActivity.java
@@ -157,6 +157,10 @@
                 if(HintMax.getText().toString().length() != 0){
                     System.out.println("Gakuto:MasterActivity ヒントマックス" + HintMax.getText().toString());
                     hintMax = Integer.parseInt(HintMax.getText().toString());
+                    //マックス０は受け付けない
+                    if(hintMax == 0){
+                        hintMax = 1;
+                    }
                 }