diff --git a/main.lua b/main.lua
index 046c563..fc58005 100644
--- a/main.lua
+++ b/main.lua
@@ -77,12 +77,15 @@ local function generate_bait_link()
 end
 
 local function fit_font_to_line_height (font_name, height)
+    assert(type(font_name) == 'string')
+    assert(type(height) == 'number')
+    --
     local size_min, size_max  =  1, 50
     while true do
         local size_guess  =  math.floor((size_max + size_min)/2)
         assert(size_min <= size_guess and size_guess <= size_max)
         local font  =  assert(imlib.font.load(font_name..'/'..size_guess))
-        if size_guess == size_min then  return font end
+        if size_guess == size_min then  return font, size_guess  end
         local text_w, text_h  =  font:get_size 'k'
         --
         if text_h <= height then  size_min = size_guess
@@ -92,13 +95,21 @@ local function fit_font_to_line_height (font_name, height)
     return nil
 end
 
+local function load_font_of_size (font_name, size)
+    return assert(imlib.font.load(font_name..'/'..size))
+end
+
 local function determine_required_font_size (font_name, text, width)
+    assert(type(font_name) == 'string')
+    assert(type(text) == 'string')
+    assert(type(width) == 'number')
+    --
     local size_min, size_max  =  1, 50
     while true do
         local size_guess  =  math.floor((size_max + size_min)/2)
         assert(size_min <= size_guess and size_guess <= size_max)
-        local font  =  assert(imlib.font.load(font_name..'/'..size_guess))
-        if size_guess == size_min then  return font end
+        local font  =  load_font_of_size(font_name, size_guess)
+        if size_guess == size_min then  return font, size_guess  end
         local text_w, text_h  =  font:get_size(text)
         --
         if text_w <= width then  size_min = size_guess
@@ -147,7 +158,7 @@ end
 
 local function determine_font_and_lines_for_box (font_name, text, width, height)
     local num_lines, last_actual, actual_lines  =  1, nil, nil
-    for iteration = 1, 10 do
+    for iteration = 1, 100 do
         local estimate_font  =  determine_required_font_size(font_name, text, width * num_lines)
         local line_height = select(2, estimate_font:get_size(text))
 
@@ -167,9 +178,19 @@ local function determine_font_and_lines_for_box (font_name, text, width, height)
     end
 
     assert(actual_lines)
-    local actual_font  =  fit_font_to_line_height(font_name, height / #actual_lines)
+    -- Find final font size
+    local _, min_font_size  =  fit_font_to_line_height(font_name, height / #actual_lines)
+    for _, line in ipairs(actual_lines) do
+        min_font_size  =  math.min(min_font_size, select(2, determine_required_font_size(font_name, line, width)))
+    end
+    local actual_font  =  load_font_of_size(font_name, min_font_size)
+
+    -- Assertions and error correction
+    if (#actual_lines * select(2, actual_font:get_size(text)) < height) then
+        io.write(' !! Performed bad fitting of text: '..text..'\n')
+        actual_font, actual_lines  =  determine_required_font_size(font_name, text, width), {text}
+    end
 
-    assert(#actual_lines * select(2, actual_font:get_size(text)) < height)
     return actual_font, actual_lines
 end
 
@@ -400,6 +421,7 @@ local function generate_brain_explosion_image (topics)
     assert(type(topics) == 'table' and 1 <= #topics and #topics <= BRAIN_MAX_EXPLOSION_TOPICS)
     --
     local base_img = imlib.image.new(BRAIN_ROW_WIDTH * 2, BRAIN_ROW_HEIGHT * #topics)
+          base_img:fill_rectangle(0, 0, BRAIN_ROW_WIDTH * 2, BRAIN_ROW_HEIGHT * #topics, COLOR_WHITE)
     local font_name = choose_random_font()
     --
     for i, topic_info in ipairs(topics) do