-bindkey -M isearch '^P' history-incremental-search-backward
-bindkey -M isearch '^N' history-incremental-search-forward
+if [[ $ZSH_VERSION == (4.<4->*|<5->*) ]]; then
+ bindkey -M isearch '^P' history-incremental-search-backward
+ bindkey -M isearch '^N' history-incremental-search-forward
+fi