diff --git a/lua/hop/init.lua b/lua/hop/init.lua
index b82c87cd..4f5c9a5e 100644
--- a/lua/hop/init.lua
+++ b/lua/hop/init.lua
@@ -116,11 +116,20 @@ local function set_unmatched_lines(buf_handle, hl_ns, top_line, bottom_line, cur
     priority = prio.DIM_PRIO
   }
 
-  if end_col then
-    local current_line = vim.api.nvim_buf_get_lines(buf_handle, cursor_pos[1] - 1, cursor_pos[1], true)[1]
-    local current_width = vim.fn.strdisplaywidth(current_line)
+  local current_line = vim.api.nvim_buf_get_lines(buf_handle, cursor_pos[1] - 1, cursor_pos[1], true)[1]
+  local current_width = vim.fn.strdisplaywidth(current_line)
 
-    if end_col > current_width then
+  -- keep start_col within valid range
+  if current_width == 0 then
+    start_col = 0
+  elseif start_col >= current_width then
+    start_col = current_width - 1
+  end
+  if end_col then
+    -- keep end_col within valid range
+    if current_width == 0 then
+      end_col = 0
+    elseif end_col >= current_width then
       end_col = current_width - 1
     end
 
diff --git a/lua/hop/window.lua b/lua/hop/window.lua
index 289b04ad..d4ab1c0a 100644
--- a/lua/hop/window.lua
+++ b/lua/hop/window.lua
@@ -3,35 +3,37 @@ local hint = require'hop.hint'
 local M = {}
 
 local function window_context(win_handle, cursor_pos)
-  -- get a bunch of information about the window and the cursor
-  vim.api.nvim_set_current_win(win_handle)
-  local win_info = vim.fn.getwininfo(win_handle)[1]
-  local win_view = vim.fn.winsaveview()
-  local top_line = win_info.topline - 1
-  local bot_line = win_info.botline
-
-  -- NOTE: due to an (unknown yet) bug in neovim, the sign_width is not correctly reported when shifting the window
-  -- view inside a non-wrap window, so we can’t rely on this; for this reason, we have to implement a weird hack that
-  -- is going to disable the signs while hop is running (I’m sorry); the state is restored after jump
-  -- local left_col_offset = win_info.variables.context.number_width + win_info.variables.context.sign_width
-  local win_width = nil
-
-  -- hack to get the left column offset in nowrap
-  if not vim.wo.wrap then
-    vim.api.nvim_win_set_cursor(win_handle, { cursor_pos[1], 0 })
-    local left_col_offset = vim.fn.wincol() - 1
-    vim.fn.winrestview(win_view)
-    win_width = win_info.width - left_col_offset
-  end
+  -- get window context without changing current window
+  return vim.api.nvim_win_call(win_handle, function()
+    -- get a bunch of information about the window and the cursor
+    local win_info = vim.fn.getwininfo(win_handle)[1]
+    local win_view = vim.fn.winsaveview()
+    local top_line = win_info.topline - 1
+    local bot_line = win_info.botline
+
+    -- NOTE: due to an (unknown yet) bug in neovim, the sign_width is not correctly reported when shifting the window
+    -- view inside a non-wrap window, so we can’t rely on this; for this reason, we have to implement a weird hack that
+    -- is going to disable the signs while hop is running (I’m sorry); the state is restored after jump
+    -- local left_col_offset = win_info.variables.context.number_width + win_info.variables.context.sign_width
+    local win_width = nil
+
+    -- hack to get the left column offset in nowrap
+    if not vim.wo.wrap then
+      vim.api.nvim_win_set_cursor(win_handle, { cursor_pos[1], 0 })
+      local left_col_offset = vim.fn.wincol() - 1
+      vim.fn.winrestview(win_view)
+      win_width = win_info.width - left_col_offset
+    end
 
-  return {
-    hwin = win_handle,
-    cursor_pos = cursor_pos,
-    top_line = top_line,
-    bot_line = bot_line,
-    win_width = win_width,
-    col_offset = win_view.leftcol
-  }
+    return {
+      hwin = win_handle,
+      cursor_pos = cursor_pos,
+      top_line = top_line,
+      bot_line = bot_line,
+      win_width = win_width,
+      col_offset = win_view.leftcol
+    }
+  end)
 end
 
 -- Collect all multi-windows's context:
@@ -64,9 +66,9 @@ function M.get_window_context(multi_windows)
   end
 
   for _, w in ipairs(vim.api.nvim_tabpage_list_wins(0)) do
-    local b = vim.api.nvim_win_get_buf(w)
-    if w ~= cur_hwin then
-
+    -- suppress error "Invalid buffer id: N" when this is a floating window
+    local b = vim.F.npcall(vim.api.nvim_win_get_buf, w)
+    if w ~= cur_hwin and b then
       -- check duplicated buffers; the way this is done is by accessing all the already known contexts and checking that
       -- the buffer we are accessing is already present in; if it is, we then append the window context to that buffer
       local bctx = nil