diff --git a/stackline/stack.lua b/stackline/stack.lua
index 6a241d1..a860507 100644
--- a/stackline/stack.lua
+++ b/stackline/stack.lua
@@ -70,6 +70,7 @@ end -- }}}
 
 function Stack:getWindowByPoint(point) -- {{{
    local foundWin = u.filter(self.windows, function(w)
+       if not w.indicator then return false end
        local indicatorEls = w.indicator:canvasElements()
        local wFrame = hs.geometry.rect(indicatorEls[1].frame)
        return point:inside(wFrame)
diff --git a/stackline/stackline.lua b/stackline/stackline.lua
index efc9bb7..94e1ceb 100644
--- a/stackline/stackline.lua
+++ b/stackline/stackline.lua
@@ -16,6 +16,11 @@ stackline.window = require 'stackline.stackline.window'
 function stackline:init(userConfig) -- {{{
     log.i('starting stackline')
 
+    if stackline.manager then
+        -- guard against re-initializtion https://github.com/AdamWagner/stackline/issues/46#issuecomment-723527826
+        return print('stackline already initialized')
+    end
+
     -- Default window filter controls what windows hs "sees"
     -- Required before initialization
     self.wf = wf.new():setOverrideFilter{  -- {{{