Uncaught TypeError: Cannot read property 'value' of null

[niclasnilsson]

When running the first example from the docs:

(proto-repl-charts.charts/line-chart
 "Trigonometry"
 {"sin" (map #(Math/sin %) (range 0.0 6.0 0.2))
  "cos" (map #(Math/cos %) (range 0.0 6.0 0.2))})

the error below occurs. But - it doesn't happen the first time I execute it, only when I execute it the second time (and third, ...).

Atom: 1.15.0 x64 Electron: 1.3.13 OS: Mac OS X 10.11.6 Thrown From: proto-repl-charts package 0.4.0

Stack Trace

Uncaught TypeError: Cannot read property 'value' of null

At /Users/nicke/.atom/packages/proto-repl-charts/node_modules/jg-c3/c3.js:3864

TypeError: Cannot read property 'value' of null
    at /packages/proto-repl-charts/node_modules/jg-c3/c3.js:3864:56
    at Array.sort (native)
    at ChartInternal.c3_chart_internal_fn.getTooltipContent (/packages/proto-repl-charts/node_modules/jg-c3/c3.js:3863:15)
    at ChartInternal.tooltip_contents (/packages/proto-repl-charts/node_modules/jg-c3/c3.js:1273:54)
    at ChartInternal.c3_chart_internal_fn.showTooltip (/packages/proto-repl-charts/node_modules/jg-c3/c3.js:3947:49)
    at /packages/proto-repl-charts/node_modules/jg-c3/c3.js:2481:24)
    at SVGRectElement.__onmousemove (/packages/proto-repl-charts/node_modules/d3/d3.js:1120:18)

Commands

     -1:52 proto-repl:execute-top-block (input.hidden-input)
  6x -1:42.7.0 vim-mode-plus:move-right (input.hidden-input)
     -1:41.2.0 vim-mode-plus:replace-character (input.hidden-input)
     -1:41 vim-mode-plus:set-input-char-1 (input.hidden-input)
  2x -1:40.4.0 vim-mode-plus:reset-normal-mode (input.hidden-input)
     -1:39.1.0 proto-repl:execute-top-block (input.hidden-input)
     -1:31.1.0 autocomplete-plus:cancel (atom-text-editor.editor.is-focused)
     -1:26.4.0 vim-mode-plus:move-up (input.hidden-input)
     -1:24.5.0 proto-repl:execute-top-block (input.hidden-input)
     -1:22.6.0 proto-repl:toggle (input.hidden-input)
  2x -1:22.4.0 autocomplete-plus:cancel (atom-text-editor.editor)
     -1:17 proto-repl:execute-top-block (input.hidden-input)
  3x -1:17 autocomplete-plus:cancel (atom-text-editor.editor)
     -1:15.5.0 bracket-matcher:go-to-matching-bracket (div.proto-repl-charts-chart.native-key-bindings)
  2x -1:14.8.0 core:cancel (div.proto-repl-charts-chart.native-key-bindings)
     -1:11.8.0 proto-repl:execute-top-block (input.hidden-input)

Non-Core Packages

advanced-open-file 0.16.6 
atom-beautify 0.29.17 
atom-dark-fusion-syntax 2.2.0 
atom-material-syntax 1.0.2 
atom-material-ui 1.3.9 
atom-mdtoc 0.8.3 
atomatigit 1.5.5 
autocomplete-paths 1.0.5 
autoupdate-packages 1.3.1 
blame 0.10.3 
busy 0.7.0 
busy-signal 1.3.0 
easy-motion-redux 1.1.1 
environment 1.3.1 
ex-mode 0.14.0 
expand-region 0.2.6 
file-icons 2.1.2 
file-watcher 1.1.0 
git-history 3.3.0 
git-plus 7.3.3 
golden-ratio 0.3.0 
highlight-line 0.12.0 
highlight-selected 0.13.1 
ink 0.6.5 
intentions 1.1.2 
language-diff 0.7.0 
lines 0.13.1 
linter 2.1.2 
linter-clojure 1.1.3 
linter-markdown 3.1.0 
linter-ui-default 1.2.2 
markdown-preview-enhanced 0.10.11 
markdown-scroll-sync 2.1.2 
markdown-writer 2.6.4 
maximize-panes 0.2.0 
merge-conflicts 1.4.4 
move-panes 0.2.0 
nucleus-dark-ui 0.11.0 
Parinfer 1.17.0 
project-plus 0.9.0 
proto-repl 1.4.18 
proto-repl-charts 0.4.0 
proton-mode 0.15.0 
recent-files-fuzzy-finder 0.3.1 
relative-numbers 0.7.1 
release-notes 0.53.0 
tab-switcher 1.5.4 
theme-switch 0.4.0 
vim-mode-plus 0.85.1 
vim-mode-plus-ex-mode 0.9.0 
wordcount 2.10.4 
zentabs 0.8.8