diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2509f224..6904adc8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -69,6 +69,7 @@ R-release:
       - '*.Rcheck/*'
     expire_in: '1 month'
   cache:
+    when: always
     key: "r350"
     paths:
       - installed_deps/
@@ -99,6 +100,7 @@ R-devel:
       - '*.Rcheck/*'
     expire_in: '1 month'
   cache:
+    when: always
     key: "r360"
     paths:
       - installed_deps/
diff --git a/DESCRIPTION b/DESCRIPTION
index a361e464..460550fc 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: AMR
 Version: 0.6.1.9003
-Date: 2019-05-16
+Date: 2019-05-17
 Title: Antimicrobial Resistance Analysis
 Authors@R: c(
     person(
diff --git a/R/freq.R b/R/freq.R
index c452d457..ad9b68a6 100755
--- a/R/freq.R
+++ b/R/freq.R
@@ -585,10 +585,12 @@ format_header <- function(x, markdown = FALSE, decimal.mark = ".", big.mark = ",
   # FORMATTING
   # rsi
   if (has_length == TRUE & any(x_class == "rsi")) {
-    ab <- tryCatch(as.ab(attributes(x)$opt$vars), error = function(e) NA)
-    if (!is.na(ab) & isTRUE(length(ab) > 0)) {
-      header$drug <- paste0(ab_name(ab[1L]), " (", ab[1L], ", ", ab_atc(ab[1L]), ")")
-      header$group <- ab_group(ab[1L])
+    if (!is.null(attributes(x)$opt$vars)) {
+      ab <- tryCatch(as.ab(attributes(x)$opt$vars), error = function(e) NA)
+      if (!is.na(ab) & isTRUE(length(ab) > 0)) {
+        header$drug <- paste0(ab_name(ab[1L]), " (", ab[1L], ", ", ab_atc(ab[1L]), ")")
+        header$group <- ab_group(ab[1L])
+      }
     }
     header$`%SI` <- percent(header$count_SI / (header$count_SI + header$count_R),
                             force_zero = TRUE, round = digits, decimal.mark = decimal.mark)
diff --git a/docs/reference/ab_property.html b/docs/reference/ab_property.html
index 4e7d4bac..ce7146e6 100644
--- a/docs/reference/ab_property.html
+++ b/docs/reference/ab_property.html
@@ -259,6 +259,8 @@
 
 <span class='fu'>ab_ddd</span>(<span class='no'>x</span>, <span class='kw'>administration</span> <span class='kw'>=</span> <span class='st'>"oral"</span>, <span class='kw'>units</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>, <span class='no'>...</span>)
 
+<span class='fu'>ab_info</span>(<span class='no'>x</span>, <span class='kw'>language</span> <span class='kw'>=</span> <span class='fu'><a href='translate.html'>get_locale</a></span>(), <span class='no'>...</span>)
+
 <span class='fu'>ab_property</span>(<span class='no'>x</span>, <span class='kw'>property</span> <span class='kw'>=</span> <span class='st'>"name"</span>, <span class='kw'>language</span> <span class='kw'>=</span> <span class='fu'><a href='translate.html'>get_locale</a></span>(), <span class='no'>...</span>)</pre>
     
     <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
diff --git a/docs/reference/index.html b/docs/reference/index.html
index 1f7dcfe6..458600b0 100644
--- a/docs/reference/index.html
+++ b/docs/reference/index.html
@@ -379,7 +379,7 @@
       </tr><tr>
         
         <td>
-          <p><code><a href="ab_property.html">ab_name()</a></code> <code><a href="ab_property.html">ab_atc()</a></code> <code><a href="ab_property.html">ab_cid()</a></code> <code><a href="ab_property.html">ab_synonyms()</a></code> <code><a href="ab_property.html">ab_tradenames()</a></code> <code><a href="ab_property.html">ab_group()</a></code> <code><a href="ab_property.html">ab_atc_group1()</a></code> <code><a href="ab_property.html">ab_atc_group2()</a></code> <code><a href="ab_property.html">ab_ddd()</a></code> <code><a href="ab_property.html">ab_property()</a></code> </p>
+          <p><code><a href="ab_property.html">ab_name()</a></code> <code><a href="ab_property.html">ab_atc()</a></code> <code><a href="ab_property.html">ab_cid()</a></code> <code><a href="ab_property.html">ab_synonyms()</a></code> <code><a href="ab_property.html">ab_tradenames()</a></code> <code><a href="ab_property.html">ab_group()</a></code> <code><a href="ab_property.html">ab_atc_group1()</a></code> <code><a href="ab_property.html">ab_atc_group2()</a></code> <code><a href="ab_property.html">ab_ddd()</a></code> <code><a href="ab_property.html">ab_info()</a></code> <code><a href="ab_property.html">ab_property()</a></code> </p>
         </td>
         <td><p>Property of an antibiotic</p></td>
       </tr><tr>