diff --git a/ble-core.sh b/ble-core.sh
index c59926c4..c48334ac 100644
--- a/ble-core.sh
+++ b/ble-core.sh
@@ -1478,10 +1478,10 @@ function ble-term/.initialize {
   _ble_term_IFS=$' \t\n'
   _ble_term_CR=$'\r'
 
-  if [[ $_ble_base/term.sh -nt $_ble_base_cache/$TERM.term ]]; then
-    source "$_ble_base/term.sh"
-  else
+  if [[ -s  $_ble_base_cache/$TERM.term && $_ble_base_cache/$TERM.term -nt $_ble_base/term.sh ]]; then
     source "$_ble_base_cache/$TERM.term"
+  else
+    source "$_ble_base/term.sh"
   fi
 
   _ble_util_string_prototype.reserve "$_ble_term_it"
diff --git a/ble-decode.sh b/ble-decode.sh
index b73daab6..746c3ed1 100644
--- a/ble-decode.sh
+++ b/ble-decode.sh
@@ -1583,7 +1583,7 @@ function ble-decode-bind/cmap/initialize {
 
   local init=$_ble_base/cmap/default.sh
   local dump=$_ble_base_cache/cmap+default.$_ble_decode_kbd_ver.$TERM.dump
-  if [[ $dump -nt $init ]]; then
+  if [[ -s $dump && $dump -nt $init ]]; then
     source "$dump"
   else
     echo 'ble.sh: generating "'"$dump"'"...' 1>&2
@@ -1604,7 +1604,7 @@ function ble-decode-bind/cmap/initialize {
     # 3文字以上 bind/unbind ソースの生成
     local fbinder=$_ble_base_cache/cmap+default.binder-source
     _ble_decode_bind_fbinder=$fbinder
-    if ! [[ $_ble_decode_bind_fbinder -nt $init ]]; then
+    if ! [[ -s $_ble_decode_bind_fbinder && $_ble_decode_bind_fbinder -nt $init ]]; then
       echo -n 'ble.sh: initializing multichar sequence binders... '
       ble-decode-bind/cmap/.generate-binder-template >| "$fbinder"
       binder=ble-decode-bind/cmap/.emit-bindx source "$fbinder" >| "$fbinder.bind"
@@ -1731,7 +1731,7 @@ function ble-decode-bind/.generate-source-to-unbind-default/.process {
 
 function ble-decode/bind {
   local file=$_ble_base_cache/ble-decode-bind.$_ble_bash.$bleopt_input_encoding.bind
-  [[ $file -nt $_ble_base/bind.sh ]] || source "$_ble_base/bind.sh"
+  [[ -s $file &&  $file -nt $_ble_base/bind.sh ]] || source "$_ble_base/bind.sh"
 
   # * 一時的に 'set convert-meta off' にする。
   #
diff --git a/keymap/emacs.sh b/keymap/emacs.sh
index ad64ae7b..892b8236 100644
--- a/keymap/emacs.sh
+++ b/keymap/emacs.sh
@@ -244,7 +244,8 @@ function ble-decode/keymap:emacs/define {
 
 function ble-decode/keymap:emacs/initialize {
   local fname_keymap_cache=$_ble_base_cache/keymap.emacs
-  if [[ $fname_keymap_cache -nt $_ble_base/keymap/emacs.sh &&
+  if [[ -s $fname_keymap_cache &&
+          $fname_keymap_cache -nt $_ble_base/keymap/emacs.sh &&
           $fname_keymap_cache -nt $_ble_base/cmap/default.sh ]]; then
     source "$fname_keymap_cache" && return
   fi
diff --git a/keymap/vi.sh b/keymap/vi.sh
index 6582b327..f806e629 100644
--- a/keymap/vi.sh
+++ b/keymap/vi.sh
@@ -6962,7 +6962,8 @@ function ble-decode/keymap:vi_cmap/define {
 
 function ble-decode/keymap:vi/initialize {
   local fname_keymap_cache=$_ble_base_cache/keymap.vi
-  if [[ $fname_keymap_cache -nt $_ble_base/keymap/vi.sh &&
+  if [[ -s $fname_keymap_cache &&
+          $fname_keymap_cache -nt $_ble_base/keymap/vi.sh &&
           $fname_keymap_cache -nt $_ble_base/cmap/default.sh ]]; then
     source "$fname_keymap_cache" && return
   fi
diff --git a/keymap/vi_digraph.sh b/keymap/vi_digraph.sh
index 34c4e9fc..f2fb4143 100644
--- a/keymap/vi_digraph.sh
+++ b/keymap/vi_digraph.sh
@@ -49,7 +49,8 @@ function ble-decode/keymap:vi_digraph/define {
 
 function ble-decode/keymap:vi_digraph/initialize {
   local fname_keymap_cache=$_ble_base_cache/keymap.vi_digraph
-  if [[ $fname_keymap_cache -nt $_ble_base/keymap/vi_digraph.sh &&
+  if [[ -s $fname_keymap_cache &&
+          $fname_keymap_cache -nt $_ble_base/keymap/vi_digraph.sh &&
           $fname_keymap_cache -nt $_ble_base/keymap/vi_digraph.txt ]]; then
     source "$fname_keymap_cache"
     return